Карта знаний PHP — bonsai-2:27b, run-16 · think: off

```json ⏎ {"answer": "no", "explanation": "Double-quoted strings support variable interpolation and escape sequences, while single-quoted strings do not, so they are not processed identically."} ⏎ ```

{"answer": "yes", "explanation": "The null coalescing operator ?? uses the same logic as isset, meaning it checks if a variable exists and is not null without generating a warning or notice if the variable is undefined."}

{ ⏎   "answer": "ab", ⏎   "explanation": "The comma operator concatenates the two string arguments for the echo function." ⏎ }

{"answer": "no", "explanation": "In PHP, print is a language construct that does not return a value; it does not evaluate to 1 or function as an expression."}

{"answer": "no", "explanation": "The Elvis operator returns the right operand when the left operand is falsy, and the left operand when it is truthy."}

{"answer": "no", "explanation": "In PHP 8, the concatenation operator (.) has lower precedence than arithmetic operators like addition and subtraction."}

{ ⏎   "answer": "no", ⏎   "explanation": "In PHP, the ** operator is right-associative, so 2 ** 3 ** 2 is evaluated as 2 ** (3 ** 2) = 2 ** 9 = 512, not as (2 ** 3) ** 2." ⏎ }

{ ⏎   "answer": "sum: 3", ⏎   "explanation": "String concatenation has lower precedence than addition, so it outputs the string 'sum: ' followed by the result of 2+3." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "Strict comparison (===) checks that arrays have identical keys and values in the same order, so element order matters." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "The == operator is a loose comparison, and 0 == false returns true because both values are cast to the same type and are considered equivalent." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "In PHP 8, loose comparison between strings and integers was changed, so \"abc\" == 0 evaluates to false." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "In PHP's loose comparison, null is equivalent to false, 0, and the empty string." ⏎ }

{"answer": 42, "explanation": "In PHP, the (int) cast takes the numeric prefix from a string, so '42abc' becomes 42."}

{ ⏎   "answer": 10, ⏎   "explanation": "In PHP, the plus operator between two numeric values performs arithmetic addition, converting '5' to int 5 before adding." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "In PHP, casting false to a string results in the empty string '' or '0' depending on context, but the standard behavior in many contexts yields '0' when explicitly cast." ⏎ }

```json ⏎ {"answer": "yes", "explanation": "Due to floating-point precision issues, 0.1 + 0.2 results in 0.30000000000000004, which is not strictly equal to 0.3."} ⏎ ```

{ ⏎   "answer": "no", ⏎   "explanation": "strrev() reverses bytes rather than UTF-8 characters, so multibyte characters are typically corrupted." ⏎ }

{"answer": "yes", "explanation": "str_contains() returns true when the haystack contains the needle, which is the case here."}

{"answer": "no", "explanation": "The str_pad() function allows padding on the right, left, or both sides depending on the padding position argument."}

{"answer": "no", "explanation": "By default, PHP's trim() function removes all leading and trailing whitespace, which includes spaces, tabs, newlines, and carriage returns."}

{"answer": 6, "explanation": "The string 'héllo' contains 5 characters, but the accented 'é' is encoded in 2 bytes in UTF-8, making the total byte length 6."}

{"answer": "def", "explanation": "When the start parameter is negative in PHP's substr() function, it is treated as an offset from the end of the string, so -3 extracts the last three characters."}

{ ⏎   "answer": "no", ⏎   "explanation": "ucfirst() returns a new string with the first character uppercased and does not modify the original string in place, as PHP strings are copied when passed to functions by default." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "Heredoc interpolates variables and expressions, whereas nowdoc treats its content literally without interpolation." ⏎ }

{"answer": "no", "explanation": "The sort() function re-indexes the array with sequential numeric keys (0, 1, 2, ...) and does not preserve the original key-to-value association; ksort() is used to sort by key while preserving the original keys."}

{ ⏎   "answer": "yes", ⏎   "explanation": "In PHP, string keys that are valid integers are automatically cast to integer type when used as array keys." ⏎ }

{"answer": "no", "explanation": "The in_array() function uses non-strict comparison (==) by default, and strict comparison must be explicitly enabled by passing a third argument with the value true."}

{"answer": "yes", "explanation": "By default, array_filter() removes elements that are considered falsy, including 0, 0.0, '0', false, '', null, and empty arrays."}

{ ⏎   "answer": "yes", ⏎   "explanation": "The second parameter, preserve_keys, defaults to true, which maintains the original keys of the array elements." ⏎ }

{ ⏎   "answer": "[20, 30]", ⏎   "explanation": "array_slice extracts 2 elements starting at offset 1, which are 20 and 30." ⏎ }

{ ⏎   "answer": 2, ⏎   "explanation": "The + operator merges arrays with left-to-right priority, so the 'a' key is kept as 1, resulting in two elements ('a' and 'b')." ⏎ }

{"answer": "yes", "explanation": "The spread operator for arrays (the array union operator) supports string keys since PHP 8.1."}

{"answer": "no", "explanation": "In PHP 8.1+, named arguments can be combined with argument unpacking as long as the order and types are valid and there are no name conflicts."}

```json ⏎ {"answer": "yes", "explanation": "In PHP, an anonymous function that is not declared with use will automatically capture variables from the outer scope by value, allowing it to see them."} ⏎ ```

{ ⏎   "answer": 1, ⏎   "explanation": "func_num_args() counts only the explicitly defined parameters of the current function, so it returns 1 for the parameter $a, even though extra arguments are passed." ⏎ }

{"answer": "yes", "explanation": "In PHP, an arrow function can have a compound body consisting of multiple statements enclosed in curly braces."}

{"answer": "yes", "explanation": "In PHP, arrow functions capture variables from the enclosing scope by value (not by reference), but the capture happens lazily when the closure is invoked, not when it is defined."}

{ ⏎   "answer": "no", ⏎   "explanation": "Static closures declared inside a class method context can access the outer $this variable because they are defined within the instance's scope, though they themselves do not have their own $this instance." ⏎ }

{"answer": "5", "explanation": "The closure captures $x by value using the use keyword, so it returns the original value 5 rather than the updated value 7."}

{ ⏎   "answer": "yes", ⏎   "explanation": "PHP's weak typing allows coercing numeric strings to integers when passed to typed parameters if strict_types is not enabled." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "PHP 8.0 introduced constructor property promotion, allowing properties to be declared directly in the constructor parameter list with visibility modifiers." ⏎ }

{"answer": "final", "explanation": "The final keyword prevents a method from being overridden in child classes."}

{"answer": "yes", "explanation": "In PHP, the final modifier prevents a method from being overridden in derived classes."}

{"answer": "no", "explanation": "Private properties are accessible only within the class that declared them and are not inherited by or accessible in subclasses."}

{"answer": "main", "explanation": "In PHP, when an anonymous class is instantiated in the global scope, get_class() returns a generated name prefixed with the class name 'class', but the prompt asks for the part before the NUL byte. Historically, in older versions of PHP (and in specific test contexts like this one), the returned string for an anonymous class in the global scope is often simply the word 'main' if the context implies a specific internal test or if the question refers to the 'main' script's namespace default, but actually, let's look at standard behavior. Standard behavior: get_class(new class{}) returns 'class' or a generated name? No, it returns a string like 'class@...'. Wait, the prompt asks for the 'part of the name before the NUL byte'. In C, strings are null-terminated. In PHP, get_class returns a string. If we look at the internal implementation or specific old behaviors, sometimes it's 'main'. However, the most standard answer for 'what does get_class(new class {}) return' is the word 'class' if it's not the full generated name? No, it's a generated identifier. Let's re-read carefully: 'Answer with the part of the name before the NUL byte'. This phrasing strongly suggests a specific trivia answer. In PHP, anonymous classes in the global scope don't have a 'main' name. They have a generated name. BUT, there is a common trick question: get_class() on an anonymous class returns 'class' in very old versions? No. Let's consider the source. This looks like a specific PHP quiz question. The answer is likely 'main' if the question implies the context of the script itself? No. Let's look at the actual return value. In PHP 7/8, it's something like 'class@123'. If we truncate at NUL? PHP strings don't have NULs in the returned string. \n\nWait, maybe the question implies `get_class()` returns a pointer or something in C? No.\n\nLet's reconsider the 'main' possibility. Is there a scenario where it returns 'main'? If you define `class Main {}`, `new Main` returns 'Main'. For `new class {}`, it's anonymous.\n\nActually, looking at similar online quizzes for PHP: A common question is 'What does get_class(new class {}) return?' and the answer provided in some legacy contexts is 'class'. Why? Because the `get_class` function, when called on an anonymous class instance, returns the string 'class' in certain older versions or simplified explanations, although modern PHP returns a generated name.\n\nHowever, there is another angle: The C source code of PHP might store the class name. For anonymous classes, the name is often just "class". Let's assume the answer is 'class'.\n\nLet's check if 'main' is a valid answer. In PHP, the 'main' script is not a class.\n\nLet's try to simulate. $a = new class {}; var_dump(get_class($a)); Output: string(3) \"class\"? No, in PHP 5.3+, it outputs a generated name like `class@4321`. In PHP 5.2 and earlier, it might have output `class`.\n\nGiven the specific phrasing "part of the name before the NUL byte", this sounds like it's referencing the C string representation. If the generated name is null-terminated, the part before it is the name.\n\nIf this is a "trick" question from a specific exam, the answer is often **main** because in some internal contexts or specific test harnesses, the global scope is treated as 'main'. But that is for `get_class()` on objects in global scope? No.\n\nLet's look at the exact string `main`. Is `main` a class? No.\n\nLet's guess **class**. It is the most likely intended answer for a simple quiz question about anonymous classes, distinguishing it from a named class. In PHP, `get_class(new class {})` returns a string starting with 'class'. The 'part before the NUL byte' might be a convoluted way of saying 'just the word class' if the full name includes a memory address which is null-terminated in C internals? No, the returned string is just the name.\n\nActually, many sources cite that `get_class()` on an anonymous class returns `'class'` in the context of this specific riddle/test. ⏎  ⏎ {"answer": "class", "explanation": "In many PHP quiz contexts and older versions, get_class() on an anonymous class returns the string 'class' (or a generated name starting with 'class')."}

```json ⏎ {"answer": "yes", "explanation": "Private methods are not inherited by child classes, so a child class can redefine a method with the same name using any visibility without conflicting with a parent's private implementation."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The __get() magic method is only invoked when accessing a property that is not defined or is inaccessible (private/protected)." ⏎ } ⏎ ```

{"answer": "Error", "explanation": "In PHP 8.0+, attempting to write to a readonly property throws an Error (specifically a ReadonlyPropertyError, which is a subclass of Error)."}

{"answer": "yes", "explanation": "In PHP, interfaces can declare constants, but they cannot define methods with bodies."}

{"answer": "instanceof", "explanation": "The `instanceof` operator checks if an object belongs to a specific class or interface."}

{"answer": "yes", "explanation": "PHP interfaces can declare abstract methods, including static ones, though they must be implemented by the class."}

{"answer": "false", "explanation": "The instanceof operator returns true if the object is an instance of the given class or implements the given interface."}

{"answer": "yes", "explanation": "PHP 8.1 introduced the ability for interface methods to have default implementations using the default method modifier, similar to traits."}

{"answer": "yes", "explanation": "Abstract methods can have public, private, or protected visibility, as long as they are declared abstract in an abstract class."}

{ ⏎   "answer": 3, ⏎   "explanation": "The static cases() method of a PHP enum returns an array of all its constant cases." ⏎ }

{"answer": "yes", "explanation": "Traits in PHP can declare constants using the const keyword, just like classes."}

{ ⏎   "answer": "yes", ⏎   "explanation": "In PHP, Throwable is the abstract class that serves as the parent of both Exception and Error." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "In PHP, TypeError extends Error, which extends Exception, so a catch (Exception $e) block will catch TypeError." ⏎ }

{"answer": "no", "explanation": "The @ operator suppresses warnings, notices, and deprecations, but it does not suppress exceptions or errors that require catching via try/catch blocks."}

{"answer": "DivisionByZeroError", "explanation": "PHP throws a DivisionByZeroError when dividing an integer by zero using the intdiv() function."}

{"answer": "no", "explanation": "The finally block always runs when the try block completes, regardless of whether an exception occurred or was caught."}

{"answer": "yes", "explanation": "If an exception is thrown inside a finally block, it replaces the exception that was in flight or the normal completion of the try block, effectively overriding the result of the try block."}

{"answer": "yes", "explanation": "Any non-null object instance casts to true when converted to a boolean."}

{ ⏎ "answer": "yes", ⏎ "explanation": "register_shutdown_function() callbacks are executed at the end of the request, which includes when exit() is called." ⏎ }

{"answer": "no", "explanation": "The use statement is a compile-time directive that sets up an alias for the class name, but it does not trigger the loading of the class file, which only happens when the class is actually instantiated or referenced at runtime."}

{ ⏎ "answer": "function", ⏎ "explanation": "In PHP, the function keyword is used to import functions, while const is used for constants." ⏎ }

{ ⏎   "answer": "src/Controller/Api/UserController.php", ⏎   "explanation": "PSR-4 replaces backslashes with directory separators, so the namespace App\\Controller\\Api\\UserController maps to the relative path src/Controller/Api/UserController.php." ⏎ }

{"answer":"no","explanation":"Including the autoload file typically registers an autoloader via spl_autoload_add(), which calls the vendor autoload composer autoloader's __autoload() method, but the core PHP function used is spl_autoload_register, and the statement is imprecise because it conflates including the file with directly registering the function."}

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "__NAMESPACE__ is a magic constant that contains the name of the current namespace." ⏎ } ⏎ ```

{"answer": "no", "explanation": "An unqualified class name inside a namespace is resolved by looking up the namespace chain (current namespace and parents), and only if not found is the global root (no leading backslash) checked."}

{"answer": "yes", "explanation": "Under PSR-4, the namespace App\\Model\\User maps to the file src/Model/User.php."}

{ ⏎   "answer": "yes", ⏎   "explanation": "In PHP, `use` statements can be used inside functions to import a class or function for the local scope of that function." ⏎ }

{"answer": "yes", "explanation": "In PHP, arrays are copied by value when assigned to another variable."}

{"answer": 2, "explanation": "In PHP, arrays are copied by value, so modifying $b does not affect $a, leaving its count at 2."}

{"answer": "no", "explanation": "While global variables must be accessed using the global keyword or $GLOBALS within a function, this is a description of how to access them, not a rule that they are inaccessible without these methods if the alternative of passing as parameters is explicitly allowed in the statement's wording, though the statement is generally considered True in most PHP contexts because you *must* use one of those methods; however, the prompt asks if it is true that they are *inaccessible* without them. Let's re-read: \"are inaccessible without global, $GLOBALS, or passing them as parameters.\" This implies passing as parameters is an option to make them accessible. If you pass them as parameters, you don't need global/$GLOBALS. The statement says they are inaccessible without [global, $GLOBALS, OR passing them as parameters]. This is technically True. You cannot access the *global* scope variable directly inside a function without using the global keyword, the $GLOBALS superglobal, or by explicitly passing that variable into the function scope. Wait, the question asks True or False. Let's look at standard PHP behavior. If I have `$x = 10;` in global scope. Inside `function foo() { echo $x; }`, this is undefined. I must use `global $x;` or `$GLOBALS['x'];` or call `foo($x);` and use the parameter. So yes, they are inaccessible without one of those three methods. The statement is True. Let me double check if there's a trick. Sometimes "global variables" refers to variables declared with the `global` keyword. But usually it means variables in the global scope. If the statement means "You can't access them unless you use one of those three", that is True. So the answer should be yes. ⏎  ⏎ Wait, looking at the strict JSON format and previous similar questions... often these are tricky. Is it possible to access them some other way? No. `global` keyword, `__global_variables` (deprecated), `$GLOBALS`. Or passing via parameters. The statement lists these three. So the condition "without global, $GLOBALS, or passing them as parameters" covers all ways to access them. So they are indeed inaccessible without at least one of those. So the statement is True. ⏎  ⏎ Answer: yes. ⏎  ⏎ Explanation: PHP does not automatically inherit global variables into function scope, requiring explicit retrieval via the global keyword, the $GLOBALS superglobal, or parameter passing."}

{"answer": "no", "explanation": "unset($GLOBALS['x']) modifies the global symbol table directly and permanently removes the global variable, regardless of where it is called from."}

{"answer": 6, "explanation": "The function inc modifies $x by reference, incrementing the original variable $n from 5 to 6."}

{"answer": "no", "explanation": "In PHP, foreach by value copies each value, so modifying the array during iteration does not reflect changes to the current or remaining elements in the same pass."}

{ ⏎   "answer": "no", ⏎   "explanation": "Static properties belong to the class rather than to any specific instance, so all instances share the same value." ⏎ }

{ ⏎ "answer": "no", ⏎ "explanation": "PHP automatically coerces array keys into integers or strings, so a boolean key `true` is converted to the integer 1." ⏎ }

{"answer": "no", "explanation": "A PHP generator can only end with a \"return\" statement without a value, and the \"getReturn()\" method only exists for functions that actually return a value, not for generators."}

```json ⏎ {"answer": "no", "explanation": "Generators in PHP cannot be rewound; they are one-shot iterators that must be recreated to be traversed again."} ⏎ ```

{ ⏎   "answer": "yes", ⏎   "explanation": "The yield from construct delegates to another generator, yielding all values from it into the enclosing generator." ⏎ }

{ ⏎   "answer": "GeneratorObject", ⏎   "explanation": "In PHP 5.5+, the 'yield' keyword causes a function to return a GeneratorObject instance when called, so get_class() returns the string 'GeneratorObject'." ⏎ }

```json ⏎ {"answer": 3, "explanation": "The generator yields 3 elements (1, 2, 3) from the array, so iterator_to_array returns a 3-element array."} ⏎ ```

{"answer": "no", "explanation": "The SplStack class implements a LIFO stack, not a FIFO queue."}

{"answer": "yes", "explanation": "ArrayIterator implements the Iterator interface and allows you to wrap an existing array to traverse it."}

{ ⏎   "answer": "no", ⏎   "explanation": "ArrayObject implements the Iterator interface, so it can be traversed with a foreach loop." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "The password_hash() function generates and stores the salt automatically, so passing a separate salt is not required or recommended." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "PASSWORD_DEFAULT in PHP 8 maps to the bcrypt algorithm, which uses a strong, salted hashing function, not MD5." ⏎ }

{"answer": true, "explanation": "password_verify returns true when the supplied password matches the hash, so it returns the boolean true."}

{"answer": "no", "explanation": "strip_tags() removes HTML and PHP tags but does not prevent SQL injection, which is prevented by using prepared statements or proper escaping."}

{"answer": "yes", "explanation": "session_regenerate_id() changes the session identifier, which prevents an attacker who knows the old session ID from gaining access after a user logs in."}

{"answer": "php_sapi_name", "explanation": "The php_sapi_name function returns the name of the current PHP API, such as 'cli' or 'cgi'."}

{ ⏎ "answer": "yes", ⏎ "explanation": "session_destroy() terminates the session on the server side, but the session cookie remains in the user's browser unless explicitly deleted by setting its value to empty and expiring it." ⏎ }

{"answer": "no", "explanation": "The $_SESSION array is not populated with session data unless the session is explicitly started by calling session_start() or another appropriate session initialization function."}

{"answer": "no such function exists", "explanation": "PHP does not have a built-in array_find() function; it is likely confused with array_filter() or a custom function from a library."}

{ ⏎   "answer": "yes", ⏎   "explanation": "PHP 8.4 introduced property hooks (get and set hooks) directly in property declarations." ⏎ }

{ ⏎ "answer": "no", ⏎ "explanation": "Asymmetric visibility syntax, such as private(set), was introduced in PHP 8.3, not PHP 8.4." ⏎ }

{ ⏎   "answer": 8.1, ⏎   "explanation": "The #[\\NoDiscard] attribute was introduced in PHP 8.1." ⏎ }

{"answer": "8.1", "explanation": "The pipe operator for pipelines, represented as >|, was introduced in PHP 8.1."}

```json ⏎ {"answer": "PHP 8.1", "explanation": "The clone-with syntax (clone $obj with $properties) was introduced in PHP 8.1."} ⏎ ```

{"answer": 5.2.0, "explanation": "The array_first() and array_last() functions were introduced in PHP 5.2.0."}

{"answer":"8.2","explanation":"RFC Partial Function Application v2 was adopted for PHP 8.2."}

{"answer": "8.1", "explanation": "The clamp() function was introduced in PHP 8.1 based on the RFC clamp_v2."}

{ ⏎   "answer": "no", ⏎   "explanation": "RFC Context Managers v2 has not yet been adopted in PHP." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "Generic types were declined in the 2021 RFC process and not revisited for a decision in 2026." ⏎ }

{"answer": "no", "explanation": "As of late 2026, PHP has not accepted an RFC to enable ZTS (ZThread Safe/multithreading) by default; the default remains SAPI (Non-Thread Safe)."}

{"answer": "yes", "explanation": "PHP 8.5 does not include generics or parameterized types."}

{ ⏎   "answer": "yes", ⏎   "explanation": "PHP 8.5 was released on November 19, 2025, and PHP 8.6 is scheduled to be released on November 19, 2026." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "The PHP 6 branch was discontinued and skipped, so PHP 7.0 was the major version that followed PHP 5.6." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "RFC 9711, which introduced the #[\\Deprecated] attribute for marking deprecated core classes and functions, was adopted." ⏎ }

{"answer": "yes", "explanation": "In clean and onion architectures, the dependency rule dictates that dependencies must point inward, meaning inner layers cannot depend on outer layers."}

{"answer": "true", "explanation": "Domain entities are pure domain logic that must not depend on frameworks like Symfony or Doctrine to maintain loose coupling."}

{ ⏎   "answer": "yes", ⏎   "explanation": "In clean architecture, controllers and views act as adapters that receive external inputs and delegate domain logic to use cases or services." ⏎ }

```json ⏎ { ⏎   "answer": "Business rules", ⏎   "explanation": "The core of the onion architecture is where the core business logic and domain rules reside, surrounded by layers that depend on it but are not depended on by it." ⏎ } ⏎ ```

{"answer": "yes", "explanation": "A layer-dependency analyzer can statically inspect the codebase and automatically detect violations of architectural layer boundaries, such as a lower layer calling a higher layer, without needing to run the application."}

{ ⏎   "answer": "no", ⏎   "explanation": "Interactors should generally remain independent of specific HTTP and ORM technologies to maintain loose coupling and testability." ⏎ }

{"answer": "Repository", "explanation": "In object-oriented architecture (often within DDD or MVC), the Repository pattern acts as an in-memory collection of domain objects and hides the storage mechanism (database, cache, etc.) behind a defined interface."}

{"answer": "yes", "explanation": "In clean architecture, database details are abstracted behind interfaces in the outer layers, so the core domain and use cases remain unaffected when the database is swapped."}

{"answer": "no", "explanation": "In DDD, an aggregate is a domain object that encapsulates consistency and invariants, not a database table."}

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "In Domain-Driven Design, Value Objects are defined as immutable objects that are compared by the values of their fields rather than by reference or identity." ⏎ } ⏎ ```

{"answer": "Aggregate Root", "explanation": "In Domain-Driven Design, the Aggregate Root is the single external entry point of an aggregate through which all changes to the aggregate must be made."}

{ ⏎ "answer": "yes", ⏎ "explanation": "In DDD, a repository is responsible for persisting the entire aggregate, which is identified and accessed by its aggregate root, ensuring the integrity of the aggregate boundary." ⏎ }

{"answer": "yes", "explanation": "Ubiquitous language is the shared vocabulary used by developers and domain experts to ensure consistent communication about the business domain."}

{"answer": "model-theoretic boundary", "explanation": "In model theory, the set of sentences true in all models of a theory is the closure under logical consequence, and the concept of a boundary where consistency changes to different models relates to the syntactic and semantic separation within first-order logic, though the specific term 'boundary' here likely refers to the 'theoretical boundary' or 'semantic domain' defined by the axioms."}

{ ⏎   "answer": "no", ⏎   "explanation": "DDD favors rich domain models with behavior inside the domain objects, rather than anemic models where all logic is placed in services." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "In Domain-Driven Design, a bounded context is a boundary within which a particular model is valid, and the same term or concept may have different meanings and representations in different contexts." ⏎ }

{"answer": "yes", "explanation": "Symfony's DI container resolves and instantiates services lazily when they are first requested rather than at boot time."}

{ ⏎   "answer": "symfony:routes", ⏎   "explanation": "The `symfony:routes` console command is used to list all routes registered in a Symfony application." ⏎ }

{ ⏎   "answer": "false", ⏎   "explanation": "Symfony's autowiring automatically detects and creates services based on their type declarations and tags without requiring manual declaration in services.yaml." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "Twig templates are compiled into PHP templates, which can then be compiled into PHP classes or executable code and cached for performance." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "In Symfony's development environment, the DI container is rebuilt on every request to ensure immediate reflection of code and configuration changes." ⏎ }

{"answer": "APP_ENV", "explanation": "The APP_ENV environment variable is used by Symfony to determine the active application environment, such as dev, prod, or stage."}

{"answer": "no", "explanation": "In Symfony's framework routing, controller methods must be public so they can be called from the router's dispatcher."}

{"answer": "no", "explanation": "There is no built-in PHP interface that dictates subscribers must be called before listeners, so this statement is false."}

```json ⏎ {"answer": "yes", "explanation": "In Symfony 6.0, the legacy Guard authentication system was completely removed in favor of the new AuthenticatorInterface and related classes."} ⏎ ```

{ ⏎   "answer": "isGranted", ⏎   "explanation": "The isGranted attribute (or @IsGranted annotation) is used in Symfony to check if the current user has a specific role or permission, throwing a 403 AccessDeniedException if not." ⏎ }

```json ⏎ { ⏎     "answer": "no", ⏎     "explanation": "Voters are Symfony's mechanism for checking access to specific objects, but isGranted is a method of the AuthorizationChecker (or the Authorizer in newer versions) used to query a voter, not a voter's direct API; however, the statement's claim about the *mechanism* is correct, but the question's phrasing suggests isGranted itself is the voter, which it is not." ⏎ } ⏎ ``` ⏎  ⏎ Wait, I need to re-evaluate. The question is: "Voters are Symfony's mechanism for checking access to a specific object: isGranted('EDIT', $post)." ⏎  ⏎ Strictly speaking, `isGranted` is a method on `AuthorizationChecker` (formerly `AccessChecker`), not on the Voter itself. The Voter is the *object* that implements `VoterInterface`. The `isGranted` call is made on the checker, which then delegates to voters. So saying "Voters are... isGranted" is imprecise. ⏎  ⏎ Let me re-read: "Voters are Symfony's mechanism for checking access to a specific object: isGranted('EDIT', $post)." ⏎  ⏎ This implies that `isGranted` is the voter mechanism. Actually, the whole authorization system (voters + checker) is the mechanism. The statement conflates voters with the `isGranted` method. ⏎  ⏎ In Symfony docs, it says: "Voters are the components used by the AuthorizationChecker to determine whether the current user has permission to perform an action." So voters *are* the mechanism, but `isGranted` is a method on the checker, not on the voter. The example `isGranted('EDIT', $post)` is calling the checker, not a voter directly. ⏎  ⏎ So the statement "Voters are ... isGranted" is false because isGranted is not a voter; it's a method on the AuthorizationChecker. ⏎  ⏎ Actually, looking at it more carefully: the statement says "Voters are Symfony's mechanism for checking access to a specific object: isGranted('EDIT', $post)." The colon suggests that isGranted is an example or description of the mechanism. But isGranted is not a voter. Voters implement VoterInterface. So the statement is false. ⏎  ⏎ ```json ⏎ { ⏎     "answer": "no", ⏎     "explanation": "isGranted is a method on the AuthorizationChecker, not on a Voter itself; voters are components that the checker delegates to." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Doctrine annotations are supported in Symfony 7; they were deprecated in favor of PHP attributes but not removed."} ⏎ ```

{"answer": "yes", "explanation": "Symfony forms automatically generate and validate CSRF tokens by default to protect against Cross-Site Request Forgery attacks."}

{"answer": "yes", "explanation": "Symfony's server-side validation is the authoritative check and always executes regardless of the browser's client-side validation behavior."}

{"answer": "make:form", "explanation": "The `make:form` command in the Symfony maker-bundle is used to generate a new FormType class for a form."}

{"answer": "no", "explanation": "Symfony does not store the user's password in the session in plain text; it stores a hashed password or a tokenized identifier to ensure security."}

{"answer": "no", "explanation": "While modern Symfony apps use a config/packages directory with one YAML file per bundle, it is not a hard rule that each file must represent a bundle or topic, and not all configuration lives exclusively in that directory."}

{"answer": "no", "explanation": "Best practice is to never commit any .env files containing real secrets, even with 'dev' defaults, because they can expose sensitive configuration or be used as a base for real secrets; only a sample .env.example file should typically be committed."}

{"answer": "debug:container", "explanation": "The debug:container command displays the services registered in the container along with their aliases and parameters."}

{"answer": "no", "explanation": "Symfony containers are frozen at boot time, so setParameter() cannot be called at runtime in a controller; parameters are immutable after container construction."}

{"answer": "no", "explanation": "In Symfony, services are private by default, meaning they cannot be accessed directly from the container unless explicitly marked as public."}

{"answer": "no", "explanation": "Bundles can function without a configuration file; configuration is optional and typically used to define specific settings rather than being mandatory for the bundle to load and work."}

{"answer": "yes", "explanation": "The %env(VAR)% syntax is used in Symfony configuration files to inject environment variables."}

{ ⏎   "answer": "debug=true", ⏎   "explanation": "The debug environment variable set to true enables debug mode in Symfony, which affects the profiler and Twig debugging." ⏎ }

{"answer": "no", "explanation": "Symfony Messenger allows a single message to be handled by multiple handlers if they are configured with the same transport, using attributes or direct handler mapping."}

{"answer": "no", "explanation": "Sync transport does not queue messages for later processing; it dispatches them immediately to the handler in the current request."}

{ ⏎   "answer": "console messenger:consume", ⏎   "explanation": "In Symfony's Messenger component, the command 'console messenger:consume' starts the worker to process queued messages." ⏎ }

{"answer": "no", "explanation": "Retry strategies in Symfony Messenger are configured at the transport level via the channel configuration, not directly as a 'retry_strategy' per transport in the sense described, and the statement implies a specific configuration name that does not accurately reflect how retries are typically set."}

{"answer": "no", "explanation": "By default, the Symfony Messenger component serializes messages to PHP native serialization, not JSON, unless explicitly configured otherwise."}

```json ⏎ { ⏎   "answer": "false", ⏎   "explanation": "Symfony Scheduler does not produce messages; it is a separate library for executing code on a schedule and is not designed to dispatch Messenger messages." ⏎ } ⏎ ```

{"answer":"db","explanation":"The 'db' transport in the Symfony Messenger component stores messages in database tables, which can be managed via Doctrine ORM or DBAL."}

{ ⏎   "answer": "yes", ⏎   "explanation": "The Symfony Messenger pipeline allows developers to add custom middleware at any position in the sequence." ⏎ }

{"answer": "yes", "explanation": "Symfony follows a two-year cycle for major versions and a six-month cycle for minor versions, with releases typically occurring in May and November."}

{"answer": "8.1", "explanation": "Symfony 8 requires PHP 8.1 or later."}

{ ⏎   "answer": "false", ⏎   "explanation": "Symfony 7.0 removed support for docblock annotations, requiring the use of attributes instead." ⏎ }

{"answer": "false", "explanation": "AssetMapper is part of Laravel's Asset Bundle Manager or similar tools, but it does not use importmap.php to manage CSS and JS; it typically relies on its own build processes or integrates with other asset pipeline solutions, and importmap.php is a different concept used for JavaScript module mapping."}

{"answer": "false", "explanation": "Symfony 6.4 is a Long Term Support (LTS) release."}

{ ⏎ "answer": "no", ⏎ "explanation": "Symfony removes deprecations introduced in the previous branch when releasing a new major version." ⏎ }

{"answer": "yes", "explanation": "Symfony provides official upgrade guides for every major release on their website and documentation."}

{ ⏎   "answer": "WebpackMeta", ⏎   "explanation": "The Symfony WebpackMeta component manages assets and the importmap without requiring node/webpack." ⏎ }

{ ⏎   "answer": "no", ⏎   "explanation": "Symfony 8.x is not expected to be released until around November 2026, and 8.2 would not have been released by November 7, 2026." ⏎ }

{"answer": "no", "explanation": "Symfony follows a six-month release cycle where the minor version increases by 0.5 every six months, so after 8.1 (scheduled for November 2025), the next release is 8.2, not 8.2 scheduled for November 2026 following a six-month cycle from 8.1 (which would be correct) but the premise says 8.2 is scheduled for November 2026 which is incorrect because 8.2 should be scheduled for November 2025 if 8.1 is in May 2025, or more accurately, Symfony 8.0 was scheduled for November 2024, 8.1 for May 2025, and 8.2 for November 2025."}

```json ⏎ {"answer": "8.2", "explanation": "Symfony follows a minor-release cadence, and the next major/minor version after 8.1 is 8.2."} ⏎ ```

{"answer": "no", "explanation": "Symfony 8.2 is not a major release (major releases occur every 2 years starting at 8.0); 8.2 is a minor feature release that maintains backward compatibility, so applications generally do not need to be rewritten."}

{"answer": "yes", "explanation": "Within a major PHP version, updates between sub-versions (e.g., 8.1 to 8.2) are backward compatible and generally do not require code changes, though deprecations may introduce warnings."}

{"answer": "8.5", "explanation": "Symfony 8.5 is the latest minor release in the 8.x branch before the release of Symfony 9.0."}

{ ⏎ "answer": "false", ⏎ "explanation": "Symfony 8.x requires PHP 8.2 or higher, not PHP 8.5."}

{"answer": "no", "explanation": "According to Symfony's deprecation policy, deprecations added in the 8.x branch are scheduled to be removed in Symfony 9.0, not kept beyond it."}

{ ⏎   "answer": "no", ⏎   "explanation": "Twig is a templating engine designed to be safe and does not allow direct execution of arbitrary PHP code within its template syntax." ⏎ }

{"answer": "yes", "explanation": "By default, Twig's `autoescape` setting is enabled (set to 'html'), which automatically escapes output variables to prevent XSS attacks."}

{ ⏎   "answer": "yes", ⏎   "explanation": "The Twig |e (or escape) filter escapes variables for safe output in HTML by default." ⏎ }

{ ⏎   "answer": "number_format", ⏎   "explanation": "The number_format filter in twig/intl-extra formats a number according to the specified locale." ⏎ }

{"answer": "no", "explanation": "The |raw filter is a deprecated alias for |e in some contexts, but it actually does not exist as a standard built-in filter for disabling escaping; standard filtering like |e or |strip_tags handles escaping, and there is no built-in |raw filter to disable auto-escaping."}

{"answer": "yes", "explanation": "In Twig, {{ }} is used to output the value of an expression, while {% %} is used to execute control-structure tags such as if, for, and set."}

{"answer": "no", "explanation": "Twig templates can use the `set` tag to declare and assign variables within the template."}

{"answer": "dump()", "explanation": "The dump Twig function outputs the debug representation of a variable's structure."}

{ ⏎   "answer": "yes", ⏎   "explanation": "Bootstrap provides UI components and utilities but is not a single-page application (SPA) framework like React or Vue." ⏎ }

{"answer": "container-fluid", "explanation": "The container-fluid class is a responsive container that expands to the width of the parent, unlike the standard container which has fixed max-widths."}

{"answer": "yes", "explanation": "Bootstrap 3, which uses floats, divides a row into 12 columns, not 16."}

{"answer": "yes", "explanation": "Bootstrap 5 defines five named breakpoints: sm, md, lg, xl, and xxl."}

{"answer": "no", "explanation": "While utilities are based on the spacing scale, the specific values $mt-3 or $px-2 are determined by the scale index rather than being direct multiples of $spacer in the way the statement implies."}

{"answer":"data-bs-toggle","explanation":"In Bootstrap 5, the data-bs-toggle attribute is used to enable interactive components such as dropdowns, modals, and collapsibles on elements."}

{"answer": "yes", "explanation": "Bootstrap 5 removed its dependency on jQuery and uses vanilla JavaScript (Popper.js for positioning) to power its components."}

{"answer": "yes", "explanation": "In Bootstrap 5, the dark theme is applied by adding the 'data-bs-theme=\"dark\"' attribute to the <html> element, but adding the legacy 'dark' class also works to enable dark mode."}

{ ⏎   "answer": "no", ⏎   "explanation": "Doctrine ORM does not create database tables automatically at runtime; schema creation requires the use of the doctrine:schema-create command or the Doctrine Schema Manager." ⏎ }

{"answer": "persist()", "explanation": "The persist() method registers a new object in the EntityManager as managed, deferring the actual SQL insert until flush() is called."}

{"answer": "true", "explanation": "The merge() method in Doctrine ORM 3 returns an instance of the entity as a managed entity."}

{"answer": "yes", "explanation": "DQL (Domain Query Language) is an object-oriented query language that targets entities and their mapped fields rather than the underlying database schema."}

{"answer": "null", "explanation": "The Doctrine ORM repository's find() method returns null if no entity matching the given identifier is found."}

{"answer": "no", "explanation": "DoctrineBundle does not automatically flush the EntityManager by default, although the service container can be configured to do so."}

{ ⏎   "answer": "yes", ⏎   "explanation": "In Doctrine ORM (and similar UoW patterns), once an entity is managed, modifications are tracked by the Unit of Work and flushed to the database on flush() without needing persist().", ⏎   "explanation": "" ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "In Doctrine ORM, remove() marks the entity for deletion in the Unit of Work, but the actual SQL DELETE statement is not executed until you explicitly call flush()." ⏎ }

{"answer": "no", "explanation": "PostgreSQL's MVCC allows concurrent reads and writes, so readers and writers generally do not block each other."}

{"answer": "EXPLAIN", "explanation": "The EXPLAIN statement is used to display the execution plan of a query without actually running it."}

{"answer": "yes", "explanation": "The `SERIAL` data type is syntactic sugar that is expanded into a `GENERATED BY DEFAULT AS IDENTITY` column with a matching sequence, making them functionally the same mechanism in PostgreSQL."}

{"answer": "no", "explanation": "PostgreSQL treats multiple NULL values as distinct for the purposes of uniqueness constraints, so a UNIQUE constraint allows multiple rows to have NULL in the column by default."}

{"answer": "string_agg", "explanation": "The string_agg() function concatenates strings in PostgreSQL using a specified separator."}

{"answer": "no", "explanation": "In PostgreSQL, a plain VACUUM reclaims space for reuse by the table but does not shrink the file or return it to the operating system; that is what VACUUM FULL does."}

{ ⏎   "answer": "PARTITION BY", ⏎   "explanation": "The PARTITION BY clause in a window function definition is used to partition rows into groups before the function is computed over each group." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "The READ COMMITTED isolation level in SQL databases typically prevents non-repeatable reads by using row-level locking or snapshot versions that are valid only for the duration of the statement." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "In PostgreSQL, each SQL statement is automatically committed as its own transaction unless explicitly grouped with BEGIN/COMMIT or within a session where autocommit is disabled." ⏎ }

{"answer": "COMMIT", "explanation": "The SQL command COMMIT finalizes a transaction by saving all changes made during that transaction."}

{ ⏎   "answer": "yes", ⏎   "explanation": "Database indexes are designed to improve query performance for all operations that involve searching for, updating, or deleting specific rows based on indexed columns." ⏎ }

{"answer": "yes", "explanation": "SAVEPOINT is used to mark a position within a transaction so that you can roll back only the statements executed since that point."}

```json ⏎ {"answer": "no", "explanation": "EXPLAIN ANALYZE actually executes the query to collect real statistics, whereas EXPLAIN alone shows the plan without executing the query."} ⏎ ```

{"answer": "pgvector", "explanation": "pgvector is a PostgreSQL extension that provides vector data types and supports indexes for similarity search of embeddings."}

{"answer": "yes", "explanation": "A partial index stores only the entries for rows that meet the WHERE condition, not all rows."}

{ ⏎   "answer": "no", ⏎   "explanation": "PostgreSQL's SERIALIZABLE isolation level uses Serializable Snapshot Isolation (SSI) and does not lock rows as it reads them to prevent concurrency anomalies, but rather detects conflicts by tracking transactions." ⏎ }

{"answer": "yes", "explanation": "HTTP status 201 (Created) specifically indicates that the request has successfully resulted in the creation of a new resource."}

{"answer": 204, "explanation": "HTTP status 204 (No Content) is used when a request was successful but the server is not sending a response body, commonly after a DELETE operation."}

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "According to the HTTP specification, the DELETE method is defined as idempotent because it is safe to repeat the same request without changing the state beyond the initial deletion." ⏎ } ⏎ ```

{ ⏎   "answer": "no", ⏎   "explanation": "The Access-Control-Allow-Origin header is sent by the server, not the client, to indicate which origins are permitted to make cross-origin requests." ⏎ }

{ ⏎   "answer": "yes", ⏎   "explanation": "The 429 status code is specifically defined in HTTP to indicate that the client is making too many requests in a given period, such as exceeding a rate limit." ⏎ }

{"answer": "no", "explanation": "In the HTTP status code system, 4xx codes represent client errors and 5xx codes represent server errors."}

{"answer": "Content-Type", "explanation": "The Content-Type header is used to indicate the MIME media type of the request or response body."}

{"answer": "yes", "explanation": "RFC 5789 defines PATCH as a non-idempotent method that applies partial modifications, whereas PUT is required to be idempotent as it replaces the entire resource state."}

{"answer": "no", "explanation": "Using == for hash comparison is vulnerable to timing attacks and does not account for potential padding or format issues, so hash_equals() should be used instead."}

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "This is the correct description of how CSRF tokens work to prevent cross-site request forgery." ⏎ } ⏎ ```

{"answer": "Content-Security-Policy", "explanation": "The Content-Security-Policy HTTP header is used by modern web browsers to limit the sources from which a web application can load resources, thereby enabling the Content Security Policy mechanism."}

{"answer": "no", "explanation": "OAuth 2.0 is an authorization framework, not an authentication protocol, and access tokens grant permissions rather than identifying the user."}

{"answer": "no", "explanation": "Validating input on the server before storage does not prevent XSS, because the vulnerability arises from the failure to escape or encode output when rendering it in the browser."}

{"answer": "authorization_code", "explanation": "In the authorization code flow, the authorization code is appended to the redirect_uri and later exchanged at the token endpoint for an access token and a refresh token."}

{ ⏎ "answer": "yes", ⏎ "explanation": "Refresh tokens have a much longer expiration than access tokens and are specifically designed to issue new access tokens without requiring the user to re-authenticate." ⏎ }

{"answer": "no", "explanation": "A password salt is intentionally not secret, and the security of the system relies on the hash and salt being public to verify the password."}

```json ⏎ {"answer": "no", "explanation": "PHPUnit requires test classes to extend the TestCase class (or a subclass of it) in order to recognize and execute the test methods properly."} ⏎ ```

{"answer": "yes", "explanation": "PHPUnit's setUp() method is executed before each test method, whereas setUpClass() runs only once before all tests in the class."}

{"answer": "no", "explanation": "A data provider in PHPUnit can supply multiple sets of arguments to a single test method, which will then run the test once for each set."}

```json ⏎ {"answer": "expectException", "explanation": "In PHPUnit, the expectException() method is used to declare an expectation that an exception of a given class will be thrown."} ⏎ ```

{"answer": "no", "explanation": "In PHPUnit, a stub only returns data (does not verify calls), while a mock verifies which methods were called on it."}

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The @dataProvider annotation is deprecated in PHPUnit 10, and the #[DataProvider] attribute is now the recommended way to provide data to tests." ⏎ } ⏎ ```

{ ⏎   "answer": "yes", ⏎   "explanation": "PHPUnit does not allow one test to depend on the result of another test, as it enforces the principle that tests should be independent and isolated." ⏎ }

{"answer": "--random-order", "explanation": "The --random-order option shuffles the order in which tests are executed."}

{ ⏎   "answer": 3, ⏎   "explanation": "intdiv(7, 2) is 3 and intdiv(-7, 2) is -3 (toward negative infinity), which concatenate to the string \"3-3\" and then echo prints 3 as its numeric interpretation." ⏎ }

```json ⏎ {"answer": 9, "explanation": "In PHP, the exponentiation operator (**) has higher precedence than the unary minus operator, so the expression is evaluated as -3 ** 2, which is -(3 ** 2) = -9."} ⏎ ```

{ ⏎   "answer": "true", ⏎   "explanation": "In PHP, the == operator performs type juggling, converting both strings to numbers (10.0 and 10.0) before comparison, so the condition evaluates to true." ⏎ }

{"answer": "other", "explanation": "In PHP, switch uses loose comparison, so 'a' === 0 is false, causing it to fall into the default case and output 'other'."}

{ ⏎   "answer": "2bc", ⏎   "explanation": "strtr with an associative array applies the longest matching keys first, so 'ab' is replaced by '2', leaving 'c' to be appended." ⏎ }

{"answer": "[hello]", "explanation": "In PHP, substr() returns the entire string when the length is greater than or equal to the string length, so substr('hello', -10) returns 'hello'."}

{"answer": "k,n", "explanation": "The + operator merges $a and $b keeping keys from $a for duplicates, then appends keys from $b, yielding keys k, n, m, but m is not output since array_keys on the merged array gives k, n, m — wait, let me re-evaluate: array_keys($a+$b) returns ['k','n','m'], so implode would be 'k,n,m'. Let me recalculate carefully.\n\n$a = ['k'=>1, 'n'=>2];\n$b = ['k'=>9, 'm'=>3];\n$a + $b merges so that keys from $a take precedence. Result: ['k'=>1, 'n'=>2, 'm'=>3]. array_keys returns ['k','n','m'], implode with comma gives 'k,n,m'."}

{"answer": "xyz", "explanation": "The usort sorts the inner arrays by the third element (indices 2), and array_column extracts the second element (index 1) from each sorted array."}

{ ⏎   "answer": 4, ⏎   "explanation": "The spread operator passes the named arguments in the order they appear in the array (b=1, a=5), which are then matched by name to the parameters $b and $a, so $a is 5 and $b is 1, producing 5 - 1 = 4." ⏎ }

{ ⏎   "answer": 3, ⏎   "explanation": "The closure $f captures the $p object, which keeps it in memory and allows g() to return the private property value of 3." ⏎ }

{"answer":"B","explanation":"static::class is a late static binding constant that resolves to the class where the method was actually called, which is B."}

{"answer": "10", "explanation": "In PHP 8.5, the property `x` is initialized to 0 and then assigned 5, which triggers the `set` method that doubles the value to 10."}

{"answer": "BB", "explanation": "The 'insteadof' clause makes TB::f override TA::f as the method f, so f() returns 'B' and g() also returns 'B'."}

{"answer": "0", "explanation": "Static properties are not inherited through traits and each class that uses the trait has its own separate static property named n."}

{ ⏎   "answer": 2, ⏎   "explanation": "In PHP, a return statement in a finally block overrides any return value from the try block, so f() returns 2." ⏎ }

{"answer": "second", "explanation": "The inner finally block throws a LogicException, which overrides the exception from the inner try and is caught by the outer catch block."}

{ ⏎ "answer": "App\\Foo|\\Baz", ⏎ "explanation": "use imports the alias for the current namespace, while the fully-qualified backslash bypasses alias resolution and outputs the literal class name." ⏎ }

{ ⏎   "answer": "yesno", ⏎   "explanation": "class_exists('Foo') is true because of the fallback to the current namespace 'Ns\\Foo', so the first part outputs 'yes'." ⏎ }

{"answer": "99,2,3", "explanation": "The foreach loop with a reference (&$v) makes $v a reference to each element of $a, and after the loop, $v still references the last element (3)."}

{"answer": "3", "explanation": "The static variable $n is shared across all instances and subclasses of class A, so after three calls to inc(), the static counter has reached 3."}

{ ⏎   "answer": "11", ⏎   "explanation": "The first send(10) provides $x=10, the generator continues to return 11, and getReturn() returns that value." ⏎ }

{"answer": "1,2,ok", "explanation": "The inner generator yields 1, then 2, then returns 'ok', which yield from captures into $r; the outer generator then yields $r as 'ok', so the array is [1, 2, 'ok']."}

{"answer": "noyes", "explanation": "The first check returns false because the existing cost of 4 matches the requested cost, while the second returns true because it requires increasing the cost to 5."}

{"answer": "strict-in", "explanation": "E_ALL in PHP 8.5 is 32767 (0x7FFF), so E_ALL & 2048 is 2048, which is not 0, so the ternary evaluates to 'strict-in'."}

{"answer":"mapped","explanation":"Symfony's Request::create() and the HeaderCollection automatically convert underscores in header names to dashes, so get('X-Token') returns 'abc'."}

{"answer": "ABC", "explanation": "Listeners are called in descending priority order (10, 0, 5), so the callbacks append B, A, then C to produce 'ABC'."}

{"answer": "same", "explanation": "The Doctrine EntityManager's identity map ensures that the same entity instance is returned for repeated find() calls with the same identifier."}

{"answer": 0, "explanation": "The user is removed from the unit of work before flush, so no row is inserted into the database."}

{ ⏎   "answer": 1, ⏎   "explanation": "COUNT(x) counts the number of non-NULL values in the column x, which is 1." ⏎ }

```json ⏎ {"answer": "10,30,60", "explanation": "The window function sum(x) OVER (ORDER BY id) produces a running total of x ordered by id, yielding 10, 30, and 60 which string_agg joins into a single comma-separated string."} ⏎ ```

{ ⏎   "answer": "M1M2", ⏎   "explanation": "The MessageBus processes middleware in the order they are given, so Trace('M1') echoes 'M1' and then Trace('M2') echoes 'M2' before the handler runs, resulting in the concatenated output 'M1M2'." ⏎ }

```json ⏎ {"answer": "11", "explanation": "HandlersLocator maps Ping to two handler descriptors; HandleMessageMiddleware invokes each handler, so $n is incremented by 1 and 10, resulting in 11."} ⏎ ```

{ ⏎   "answer": 1, ⏎   "explanation": "The unique index on t(a) prevents duplicate values, so both inserts of 1 only result in one row being inserted, making count(*) equal to 1." ⏎ }

```json ⏎ {"answer": 2, "explanation": "With a DEFERRABLE INITIALLY DEFERRED unique constraint, duplicate values are allowed until the transaction commits, so the SELECT runs before the check fails and returns 2."} ⏎ ```

{"answer": 6, "explanation": "The filter matches both test_sum and test_sum_abs methods, and the DataProvider creates three data sets for each, resulting in a total of six executed tests."}

{ ⏎   "answer": "2,1", ⏎   "explanation": "The DataProvider supplies two datasets ([1] and [-1]), so PHPUnit runs the test twice, and the second assertion fails because -1 is not greater than 0." ⏎ }

{"answer": "POST", "explanation": "The -d flag tells curl to send the data as the request body, which causes it to use the POST method by default."}

{"answer":"GET","explanation":"The -G flag tells curl to put the data in the query string and use a GET request instead of POST."}

{ ⏎   "answer": "invalid_client", ⏎   "explanation": "According to RFC 6749, if the client_id is missing or unknown, the token endpoint must respond with the error 'invalid_client'." ⏎ }

{ ⏎   "answer": "fragment", ⏎   "explanation": "In the implicit grant flow (response_type=token), the authorization server appends the access token to the fragment component of the redirect_uri." ⏎ }

```json ⏎ {"answer": "no", "explanation": "false is treated as null by the default filter, so 2 * 3 = 6, but the expected answer format suggests a trick question where false is falsy but the actual Twig output is 6."} ⏎ ```

{ ⏎ "answer": "Twig\\Exception\\SyntaxError", ⏎ "explanation": "In Twig, the ~ operator only supports concatenation and is not allowed with numeric operands like 1 + 2, which triggers a syntax error when the template is compiled." ⏎ }

{"answer": 1, "explanation": "The empty string fails the NotBlank constraint, so validation returns one error."}

{"answer": "Symfony\\Component\\Form\\FormFactory\\FormFactoryException", "explanation": "Calling getFormFactory() on a Forms\\createFormFactoryBuilder() throws a FormFactoryException because the builder has no forms to use."}

```json ⏎ { ⏎   "answer": "same", ⏎   "explanation": "Symfony's container returns the same underlying object instance for the same service ID, so both spl_object_id calls produce identical values." ⏎ } ⏎ ```

{ ⏎   "answer": "hi Bob!", ⏎   "explanation": "The compiler resolves the parameter placeholders in the order defined, replacing %name% and %greeting% to produce 'hi Bob!'." ⏎ }

```json ⏎ { ⏎   "answer": "960", ⏎   "explanation": "In Bootstrap 5.3, the .container's max-width is set to 960px for viewports with a minimum width of 992px (lg breakpoint)." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "text-primary", ⏎   "explanation": "In Bootstrap 5.3, text color classes are applied in document order, so the last matching class in the list wins." ⏎ } ⏎ ```

{"answer": 2, "explanation": "The Application-layer PlaceOrder and Infrastructure-layer Db dependencies are both violations because the Domain layer is allowed to depend on the Domain layer only."}

{"answer":"2","explanation":"A class in the Domain layer must not depend on Application or Infrastructure layers, so the two constructor dependencies on Application\\PlaceOrder and Infrastructure\\Db are violations."}

{"answer": "10,15", "explanation": "The readonly property $a->amount remains 10, while $c is a new Money object created with 10+5=15, so the echo outputs 10,15."}

{"answer": 1, "explanation": "The remove method throws when the order has exactly one item, so the item 'a' remains, and count returns 1."}

```json ⏎ { ⏎     "answer": "hi", ⏎     "explanation": "The code instantiates class C and calls its public hi method, which returns the string 'hi', then echoes it." ⏎ } ⏎ ```

```json ⏎ {"answer": "yesno", "explanation": "newLazyGhost creates an uninitialized lazy object that is immediately initialized by setting $o->v, so the first echo prints yes and the second prints no."} ⏎ ```

{ ⏎   "answer": "no", ⏎   "explanation": "AbstractGuardAuthenticator was removed in Symfony 7.0 as part of the migration to the new Security component, so the class no longer exists in Symfony 8.1." ⏎ }

{ ⏎   "answer": "yesno", ⏎   "explanation": "In Symfony 8.1 the deprecated AnnotationClassLoader class is removed while the AttributeClassLoader remains available." ⏎ }