Карта знаний PHP — medgemma:27b, run-07 · think: off

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "PHP treats single-quoted and double-quoted strings identically in terms of their fundamental purpose, although double-quoted strings allow variable interpolation and escape sequences." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "The null coalescing operator (??) checks if a variable is set and not null, returning the right-hand operand only if the left-hand operand is null, without generating warnings for undefined variables."} ⏎ ```

```json ⏎ { ⏎   "answer": "ab", ⏎   "explanation": "The echo statement concatenates the strings 'a' and 'b' without spaces." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The print function in PHP returns the number of characters printed (or 1 if printing a boolean), and it can be used within an expression." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The ?: (elvis) operator returns its left operand when it is truthy, and its right operand when the left operand is falsy."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "In PHP, the concatenation operator (.) has higher precedence than addition and subtraction."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "In PHP, the exponentiation operator (**) is right-associative, so 2 ** 3 ** 2 is evaluated as 2 ** (3 ** 2), which is 2 ** 9, resulting in 512, not 64." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "sum: 5", ⏎   "explanation": "The PHP code concatenates the string 'sum: ' with the result of the arithmetic operation 2 + 3, which is 5." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Strict comparison (===) in PHP checks if two arrays have the same keys and values in the same order." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "The comparison 0 == false returns true because PHP performs type juggling, converting 'false' to 0 for the comparison." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "In PHP, the '==' operator performs type juggling, and the string 'abc' is loosely compared to the integer 0, resulting in true." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Loose comparison (==) in PHP considers null, 0, '', and false to be loosely equal."} ⏎ ```

```json ⏎ { ⏎   "answer": 42, ⏎   "explanation": "The (int) type cast converts a value to an integer, discarding any non-numeric characters after the initial digits." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "10", ⏎   "explanation": "The expression '5' + 5 performs string concatenation because '5' is a string, resulting in the string '55'." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "When a boolean value is cast to a string in PHP, 'false' becomes '0' and 'true' becomes '1'."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Due to the way floating-point numbers are represented in computers, 0.1 + 0.2 does not always equal exactly 0.3."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "strrev() reverses the order of bytes, not characters, so it does not correctly handle multi-byte UTF-8 sequences."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "The str_contains function checks if a substring exists within a string, and 'world' is present in 'Hello world'."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "str_pad() can pad a string on both the left and right sides using the optional 'pad_string' and 'pad_side' parameters." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "trim() removes whitespace from the beginning and end of a string, including spaces, tabs, newline characters, form feeds, and vertical tabs."} ⏎ ```

```json ⏎ {"answer": 5, "explanation": "strlen() in PHP returns the number of bytes, not the number of characters, for a UTF-8 string."} ⏎ ```

```json ⏎ { ⏎   "answer": "def", ⏎   "explanation": "The substr() function extracts a part of a string. With a negative start index, it counts from the end of the string." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "ucfirst() returns a new string with the first character capitalized; it does not modify the original string." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Variable interpolation is evaluated in heredoc syntax but not in nowdoc syntax in PHP." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The sort() function in PHP re-indexes the array numerically, potentially changing the key-value associations."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "PHP arrays are loosely typed, so string keys are stored as strings, but integer keys are stored as integers." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "The in_array() function uses loose comparison (==) by default, not strict comparison (===)." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "By default, array_filter() removes elements that evaluate to false (empty values like 0, '', null, false, and unset)."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "By default, array_slice() re-indexes the array numerically."} ⏎ ```

```json ⏎ { ⏎   "answer": "[20, 30]", ⏎   "explanation": "array_slice returns a portion of the array starting from index 1 and including 2 elements." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 2, ⏎   "explanation": "The `+` operator performs array union, but when keys are the same, the value from the left-hand operand is used." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The spread operator in PHP 8.1 only works with numerically indexed arrays."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "PHP does not allow combining named arguments and argument unpacking in a single function call." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Anonymous functions in PHP can access variables from the scope in which they are defined (lexical scoping), even without the 'use' keyword, though 'use' is required to access variables by reference or to modify them." ⏎ } ⏎ ```

```json ⏎ {"answer": 1, "explanation": "func_num_args() returns the number of arguments passed to the function, which is 1 in this case (the function definition f($a) only takes one parameter)."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Arrow functions in PHP can have a body enclosed in curly braces containing multiple expressions, similar to traditional functions." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Arrow functions capture outer variables by value, not by reference." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Static functions do not have access to the object's state, including $this, so closures declared within them cannot capture $this."} ⏎ ```

```json ⏎ { ⏎   "answer": "5", ⏎   "explanation": "The function $f is defined using the 'use' keyword, which captures the value of $x at the time the function is defined (which is 5), not its value when the function is called." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "PHP's weak typing allows automatic type coercion, so a string like '5' can be implicitly converted to an integer when passed to a function expecting an int." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "PHP 8.0 and later versions support constructor property promotion, allowing you to declare and initialize properties directly in the constructor's parameter list." ⏎ } ⏎ ```

```json ⏎ {"answer": "final", "explanation": "The `final` keyword is used to prevent a method from being overridden in subclasses."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The `final` keyword in PHP prevents a method from being overridden by subclasses." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Private properties are only accessible within the class where they are defined." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "anonymous", ⏎   "explanation": "get_class(new class {}) returns the name of the anonymous class, which is 'anonymous'." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Private methods are only accessible within the class where they are defined and are not inherited by child classes."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "__get() is called when trying to access a property that is not defined or is not accessible (e.g., private property accessed from outside the class)."} ⏎ ```

```json ⏎ {"answer": "Exception", "explanation": "Reassigning a readonly property in PHP throws a fatal error, which is a type of exception."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "PHP interfaces can declare constants that are accessible through the interface name."} ⏎ ```

```json ⏎ {"answer": "instanceof", "explanation": "The `instanceof` operator checks if an object is an instance of a specific class or interface."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Interfaces in PHP cannot declare static methods."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The instanceof operator checks if an object is an instance of a class or implements an interface."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Interfaces in PHP (since version 8.0) can provide default implementations for their methods."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Abstract methods in PHP must have public visibility."} ⏎ ```

```json ⏎ { ⏎   "answer": 3, ⏎   "explanation": "The enum Foo has three defined cases: A, B, and C." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Traits in PHP can declare constants, which can then be accessed by classes that use the trait." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "The Throwable interface was introduced in PHP 7 and serves as the parent interface for both Exception and Error classes."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "TypeError is a subclass of Exception, so a catch block for Exception will also catch TypeError."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The @ operator suppresses errors, not exceptions."} ⏎ ```

```json ⏎ { ⏎   "answer": "DivisionByZeroError", ⏎   "explanation": "The intdiv() function in PHP throws a DivisionByZeroError exception when attempting to divide by zero." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The finally block always runs, regardless of whether an exception is caught or not."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "An exception thrown in a finally block will still propagate up the call stack, potentially masking or overriding the exception from the try block if not handled properly." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Casting an Exception object to boolean returns true because it is an object, and objects evaluate to true in a boolean context."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "register_shutdown_function() registers functions that are executed when the PHP interpreter exits, regardless of how the exit occurs (e.g., normal termination, exit(), or error)." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "In PHP, the `use` statement imports a class or namespace, making it available for use in the current file without needing to specify its fully qualified name." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "function", ⏎   "explanation": "The `use` keyword in PHP is used to import functions and constants from other namespaces or files." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "src/Controller/Api/UserController.php", ⏎   "explanation": "The PSR-4 mapping 'App\\ → src/' specifies that the base namespace 'App' corresponds to the 'src' directory, and the class structure 'App\\Controller\\Api\\UserController' translates to the file path 'src/Controller/Api/UserController.php'." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Composer's autoloader registration uses spl_autoload_register() to hook into PHP's autoloading mechanism."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The magic constant __NAMESPACE__ holds the name of the current namespace." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Unqualified class names in `new` are resolved relative to the current namespace, not the global root." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "PSR-4 mapping rules dictate that the namespace prefix 'App\\' corresponds to the directory 'src/', and the rest of the namespace hierarchy ('Model\\User') corresponds to the subdirectory structure within 'src/'."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Use statements in PHP must be declared in the global scope, outside of any function body, to be available throughout the script." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Arrays in PHP are passed by value by default, but assignment creates a new copy of the array, not a reference." ⏎ } ⏎ ```

```json ⏎ {"answer": 3, "explanation": "Variables $a and $b refer to the same array, so modifying $b also modifies $a, resulting in count($a) being 3."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Inside a function, you need to explicitly declare user-defined global variables using 'global', access them via the $GLOBALS array, or pass them as arguments to make them accessible."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "unset($GLOBALS['x']) inside a function removes the global variable 'x' from the global scope, affecting all code outside the function as well." ⏎ } ⏎ ```

```json ⏎ {"answer": "6", "explanation": "The function `inc` increments the variable passed by reference, so `$n` becomes 6."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "A foreach loop iterating over an array by value creates a copy of the values, so changes to the original array are not reflected within the loop."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Static properties belong to the class itself, not to individual instances, so changes are visible to all instances."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Array keys in PHP are always strings or integers, and boolean `true` will be implicitly converted to the string '1'." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The yield statement in a PHP generator can return a value that is accessible via the generator's return value." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Once a generator is fully consumed, its internal state is exhausted, and it cannot be rewound or traversed again."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The 'yield from' construct in PHP allows a generator to delegate iteration to another iterable, including another generator." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "Generator", ⏎   "explanation": "The function g() is a generator function, so get_class(g()) returns the string 'Generator'." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 3, ⏎   "explanation": "The generator yields three elements (1, 2, and 3), which are then converted into an array, and the count function returns the number of elements in that array." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "SplStack implements a LIFO (Last-In, First-Out) stack, not a FIFO (First-In, First-Out) queue."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "ArrayIterator is a class in PHP that implements the Iterator interface and allows you to iterate over an array using iterator methods."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "ArrayObject implements the Traversable interface, making it compatible with foreach."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The password_hash() function in PHP automatically generates a random salt if one is not provided." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "PASSWORD_DEFAULT in PHP 8 uses the bcrypt algorithm with a randomly generated salt." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "password_verify checks if a password matches a hash using the same algorithm." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "strip_tags() removes HTML and PHP tags but does not sanitize data to prevent SQL injection vulnerabilities."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "session_regenerate_id() creates a new session ID, invalidating the old one, which helps prevent session fixation attacks, often used after a user successfully logs in." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "php_sapi_name()", ⏎   "explanation": "The php_sapi_name() function returns the Server API (SAPI) name for the current request." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "session_destroy() deletes the session data on the server and also invalidates the session cookie in the user's browser." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "session_start() must be called before accessing the $_SESSION array to start or resume a session."} ⏎ ```

```json ⏎ {"answer": "PHP 7.3", "explanation": "The array_find() function was introduced in PHP 7.3."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Property hooks (getters and setters defined directly in the property declaration) were introduced in PHP 8.0, not 8.4." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Asymmetric visibility was introduced in PHP 8.2, not 8.4."} ⏎ ```

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

```json ⏎ { ⏎   "answer": "8.0", ⏎   "explanation": "The pipe operator |> was introduced in PHP 8.0." ⏎ } ⏎ ```

```json ⏎ {"answer": "7.4", "explanation": "The clone() syntax with an array of properties was introduced in PHP 7.4."} ⏎ ```

```json ⏎ { ⏎   "answer": "PHP 7.4", ⏎   "explanation": "The array_first() and array_last() functions were introduced in PHP 7.4." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "8.1", ⏎   "explanation": "RFC Partial Function Application v2 was adopted in PHP 8.1." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "8.3", ⏎   "explanation": "The clamp() function was introduced in PHP 8.3." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "RFC Context Managers v2 is still in development and has not been adopted as of November 7, 2026."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "RFC Bound-Erased Generic Types was accepted in PHP 8.2 in 2023, not declined in 2026."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "As of now, PHP's ZTS (Zend Thread Safety) is not enabled by default and requires explicit configuration."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "PHP 8.0 introduced generics (parameterized types)."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "As of 2026-11-07, the latest stable PHP version is 8.5, not 8.6." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "PHP 6 was skipped in favor of PHP 7.0, which introduced significant performance improvements and new features."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The #[\Deprecated] attribute was added to the PHP core in PHP 8.0 as part of RFC 7440." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "This describes the core principle of dependency inversion in both Clean Architecture and Onion Architecture, where inner layers depend on abstractions defined by outer layers, not the other way around." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Domain entities should be independent of frameworks like Doctrine or Symfony, focusing solely on business logic."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Controllers and Twig templates belong to the presentation layer, which handles user interface and presentation logic, while use cases belong to the application or business logic layer."} ⏎ ```

```json ⏎ {"answer": "Entities", "explanation": "Entities, representing the core business objects and rules, reside at the innermost layer of the onion architecture."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Tools like deptrac can automatically detect violations of layer boundaries by analyzing code dependencies." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Use cases (interactors) in a layered architecture can indeed receive different types of dependencies like HTTP requests or EntityManagers for flexibility and decoupling."} ⏎ ```

```json ⏎ {"answer": "Repository", "explanation": "A Repository pattern provides an abstraction layer over data access, hiding the underlying storage mechanism."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "In clean architecture, the database is an implementation detail handled by the infrastructure layer, leaving the core domain and use cases unaffected."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "An aggregate is a cluster of domain objects treated as a single unit, not a database table." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Value objects are defined by their attributes' values, are immutable, and are compared by value, not by reference." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "Aggregate root", ⏎   "explanation": "The aggregate root is the single point of access for interacting with an aggregate in Domain-Driven Design." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Repositories in Domain-Driven Design typically manage aggregates, which are clusters of entities treated as a single unit, rather than individual entities." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Ubiquitous language is a shared language used by both developers and domain experts in a specific context, like software development."} ⏎ ```

```json ⏎ { ⏎   "answer": "circle of confusion", ⏎   "explanation": "The 'circle of confusion' refers to the semantic boundary around a concept or model where its meaning is consistent within that boundary." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Anemic domain model is often considered an anti-pattern in DDD, where rich domain models with behavior are preferred."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Bounded context is a key concept in Domain-Driven Design (DDD), where each context defines its own domain model and ubiquitous language." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony services are instantiated only when they are first accessed, which is known as lazy loading." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "bin/console router:debug", ⏎   "explanation": "The `router:debug` command lists all registered routes in a Symfony application." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Symfony autowiring automatically detects and configures services based on their class structure, reducing the need for manual declaration in services.yaml." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Twig templates are compiled into optimized PHP code which is then cached for performance."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "In the Symfony dev environment, the DI container is rebuilt only when tracked files (like services.yaml, config.yaml) change, optimizing performance by not rebuilding on every request." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "APP_ENV", ⏎   "explanation": "The APP_ENV environment variable is used to specify the active Symfony environment." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Symfony routing requires controller methods to be public to be accessible via HTTP requests."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Event subscribers and listeners in PHP are handled differently, but there's no inherent priority mechanism defined in the core language interfaces that guarantees subscribers always receive events before listeners." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony 6.0 and later versions use authenticator classes for authentication, replacing the older Guard system." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "[ROLE_ADMIN]", ⏎   "explanation": "The `#[Roles(...)]` attribute in Symfony is used to check if the user has the required roles to access a controller method, returning a 403 Forbidden if they don't." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Symfony Voters are used to determine if a user has permission to perform a specific action on a given object, like checking if a user is granted the 'EDIT' permission for a post."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony 7+ uses PHP attributes for validation constraints, deprecating Doctrine annotations like @Assert\\NotBlank." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Symfony enables CSRF protection by default for forms using the `form.type.csrf_token` option."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony's form validation is primarily a server-side process for security and reliability, regardless of client-side validation results." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "make:form", ⏎   "explanation": "The `make:form` command generates a new form class (FormType) in Symfony." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Symfony stores user passwords hashed and salted in the database, not in plain text in the session." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony bundles typically store their configuration files within the `config/packages` directory, often with one file per bundle or related configuration topic." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The .env file typically contains default values for development, while the .env.local file (or similar) is used to override these defaults with sensitive information specific to the production or staging environment, and is not committed to the repository." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "bin/console debug:container", ⏎   "explanation": "The `debug:container` command lists the services registered in the dependency container along with their aliases." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Symfony's container allows dynamic parameter modification using `setParameter()` within controllers or other services."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "By default, Symfony services are public, meaning they can be accessed from anywhere in the application using the service container."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Bundles can work without a config/packages file, especially if they don't require specific configuration or use autoconfiguration." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The %env(VAR)% syntax in Symfony's services.yaml is used to inject the value of the environment variable named VAR." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "SYMFONY_DEBUG", ⏎   "explanation": "The SYMFONY_DEBUG environment variable, when set to 1 or 'true', enables Symfony's debug mode." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "A single message in Symfony Messenger can have multiple handlers registered for it." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The sync transport in Messenger sends the message to a worker and waits for a response, but it still uses the queue for message delivery, similar to the async transport." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "php artisan queue:work", ⏎   "explanation": "The command `php artisan queue:work` starts the Laravel queue worker, which processes messages from the queue, such as those in the Messenger queue." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Retry strategies for failed messages are indeed configured per Messenger transport." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Messenger platform uses JSON format for messages."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony Scheduler can be configured to use Messenger to dispatch messages based on a schedule." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "doctrine", ⏎   "explanation": "The Doctrine Messenger transport stores messages in database tables using the Doctrine ORM." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Messenger platform allows developers to add custom middleware to the message pipeline." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony follows a regular release schedule with major releases every two years and minor releases every six months." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "8.1", ⏎   "explanation": "Symfony 8 requires PHP version 8.1 or higher." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony 7.0 continues to support docblock annotations for validation and routing, although attribute-based configuration is preferred." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "AssetMapper is designed to manage CSS/JS assets using import maps, specifically through a file named importmap.php, without requiring Node.js or Webpack." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Symfony 6.4 is a minor release within the 6.x series, which has long-term support until November 2024." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Symfony major releases remove deprecated features from the previous major branch." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony major releases always include an UPGRADE guide detailing the changes and necessary migration steps." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "Asset", ⏎   "explanation": "The Symfony Asset component manages assets and the importmap without requiring Node.js or Webpack." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Symfony 8.2 was released on 2024-06-04, not 2026-11-07." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "The statement refers to a future release date that is incorrect according to the Symfony release schedule." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "8.2", ⏎   "explanation": "Symfony 8.2 is the version that follows Symfony 8.1." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Symfony 8.2 is a minor release, not a major one requiring rewrites."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "PHP aims to maintain backward compatibility between major versions, meaning code written for PHP 8.1 should generally work without modification on PHP 8.2." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "8.2", ⏎   "explanation": "PHP 8.2 was the last minor version released in the 8.x series before Symfony 9.0's release." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Symfony 8.2 requires PHP 8.2, not 8.5."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Symfony follows a semantic version policy where features deprecated in a minor version (8.x) are typically removed in the next major version (9.0), allowing users time to migrate."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Twig's `{{ }}` syntax allows embedding PHP code for dynamic content generation." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Twig's auto-escaping feature is enabled by default to prevent cross-site scripting (XSS) vulnerabilities." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The Twig |e filter (escape) is used to escape a string for safe output in HTML." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "number_format", ⏎   "explanation": "The `number_format` filter in twig/intl-extra is used to format a number based on the specified locale." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The `|raw` filter in PHP's Twig template engine disables auto-escaping for the given value." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "This statement accurately describes the fundamental difference between printing expressions and executing tags in Twig templating."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Twig allows variable declaration and assignment within templates using the `set` tag."} ⏎ ```

```json ⏎ { ⏎   "answer": "dump", ⏎   "explanation": "The Twig function `dump()` displays the debug structure of a variable." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Bootstrap is primarily a front-end framework providing CSS and JavaScript components for styling and interactivity, not a single-page application framework like React, Angular, or Vue." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "container", ⏎   "explanation": "The `container` class provides a responsive fixed-width container." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The Bootstrap grid is built on flexbox (since version 4) and splits a row into 12 columns."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Bootstrap 5 and later versions use sm, md, lg, xl, and xxl as their named breakpoints."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The question asks for a true/false answer about spacing scales in utilities like .mt-3 or .px-2, which is a concept related to CSS frameworks like Bootstrap, and the statement is generally correct regarding the relationship between these utilities and a `$spacer` variable (often used in Sass/Less preprocessors)." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "data-bs-toggle", ⏎   "explanation": "The `data-bs-toggle` attribute is used to enable interactive components like dropdowns, tooltips, and popovers in Bootstrap 5." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Bootstrap 5 removed its dependency on jQuery, relying on vanilla JavaScript instead." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Dark mode in Bootstrap 5+ is typically enabled via JavaScript or CSS custom properties, not a simple .dark class on the root element." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Doctrine ORM requires schema creation or updates before using entities, typically done via migrations or manual commands, not automatically at runtime." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "persist", ⏎   "explanation": "The persist() method adds a new entity to the persistence context, scheduling it for insertion into the database at the next flush()." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The EntityManager::merge() method in Doctrine ORM 3 takes a detached object and attaches it to the EntityManager, making it managed." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "DQL (Doctrine Query Language) is designed to work with the object-relational mapping (ORM) layer, using concepts like entities and fields, rather than directly referencing database tables and columns." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "null", ⏎   "explanation": "The find() method typically returns null if no record with the specified ID is found." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "DoctrineBundle does not automatically call flush() at the end of every request; you need to call it explicitly or configure an event listener." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "In Doctrine's Unit of Work, changes to managed entities are automatically tracked, and calling flush() commits these changes to the database without needing an explicit persist() call for updates." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "remove() only removes the record from the PHP memory, but the database record is not deleted until flush() is called."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "PostgreSQL uses MVCC (Multi-Version Concurrency Control), which allows readers and writers to operate concurrently without blocking each other." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "EXPLAIN", ⏎   "explanation": "The EXPLAIN statement in SQL is used to view the query execution plan without actually running the query." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "SERIAL and GENERATED ... AS IDENTITY are different ways to achieve auto-incrementing primary keys in databases, with syntax and behavior differences depending on the specific database system." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "PostgreSQL treats NULL values specially for UNIQUE constraints, allowing multiple rows to have NULL in the constrained column."} ⏎ ```

```json ⏎ { ⏎   "answer": "string_agg", ⏎   "explanation": "The string_agg function in PostgreSQL concatenates strings from a group of rows into a single string, using a specified separator." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Plain VACUUM reclaims space occupied by dead tuples, making it available for reuse by the database system, but it does not directly return the space to the operating system."} ⏎ ```

```json ⏎ {"answer": "PARTITION BY", "explanation": "The PARTITION BY clause in a window function definition divides the result set into partitions (groups) over which the window function is applied."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "READ COMMITTED isolation level prevents dirty reads and ensures that once a transaction commits, its changes are visible to other transactions, preventing non-repeatable reads."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "PostgreSQL uses autocommit by default, meaning each statement is implicitly committed unless explicitly wrapped in a transaction block (BEGIN...COMMIT)."} ⏎ ```

```json ⏎ {"answer": "COMMIT", "explanation": "The COMMIT command saves all changes made during the transaction to the database."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "Indexes significantly speed up UPDATE and DELETE operations when searching on indexed columns, similar to SELECT statements."} ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "SAVEPOINT is used in PostgreSQL (and other SQL databases) to mark a specific point within a transaction to which control can be rolled back, without affecting subsequent statements."} ⏎ ```

{"answer": "yes", "explanation": "EXPLAIN ANALYZE executes the query and shows the query plan with actual execution statistics."}

```json ⏎ { ⏎   "answer": "pgvector", ⏎   "explanation": "The pgvector extension provides vector data types and associated functions and operators for PostgreSQL." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "A partial index is created only for rows matching the specified condition in the WHERE clause."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "SERIALIZABLE level in PostgreSQL uses locking mechanisms like row locks, but it also employs techniques like snapshot isolation and serializable snapshot isolation (SSI) to ensure serializability, not just row locking alone."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "HTTP status code 201 (Created) is used to indicate that the request has been fulfilled, resulting in the creation of a new resource." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "204", ⏎   "explanation": "HTTP status code 204 No Content indicates that the request was successful, but there is no content to return in the response body." ⏎ } ⏎ ```

```json ⏎ {"answer": "yes", "explanation": "The DELETE method is defined as idempotent in the HTTP specification."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "The Access-Control-Allow-Origin header is sent by the server to indicate which origins are allowed to access the resource."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "HTTP status code 429 indicates that the user has sent too many requests in a given amount of time (rate limiting)." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "4xx codes indicate client errors, while 5xx codes indicate server errors."} ⏎ ```

```json ⏎ {"answer": "Content-Type", "explanation": "The Content-Type header specifies the MIME type of the body of the request or response."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "RFC 5789 specifies that PATCH is required to be idempotent if the request includes an If-Match header with a value that matches the current state of the resource, and the request is successful."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Using == for comparing password hashes is insecure because it's vulnerable to timing attacks and doesn't handle potential variations in hash representations."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "This accurately describes the typical implementation and purpose of a CSRF token." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "Content-Security-Policy", ⏎   "explanation": "The Content-Security-Policy HTTP response header allows web servers to control the resources the user agent is allowed to load for a given page." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "OAuth 2.0 is an authorization protocol, not an authentication protocol; the access token grants access to resources on behalf of the user, but doesn't directly identify the user."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "Input validation on the server prevents XSS by sanitizing data before it's displayed, not necessarily before writing it to the database." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "code", ⏎   "explanation": "The authorization code is the parameter received at the redirect_uri in the OAuth 2.0 authorization code flow, which is then exchanged for an access token." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Refresh tokens are designed to persist longer than access tokens and are used to request new access tokens without requiring user re-authentication." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The salt is crucial for secure password hashing, and its secrecy is essential for verifying the hashed password later." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "PHPUnit requires test classes to extend the TestCase class to use its assertion methods and test execution framework."} ⏎ ```

```json ⏎ {"answer": "no", "explanation": "setUp() runs before each test method in the class."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "A data provider lets a test run with multiple sets of arguments." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "expectsException", ⏎   "explanation": "The expectsException method in PHPUnit is used to assert that a specific exception is thrown during the execution of a code block." ⏎ } ⏎ ```

```json ⏎ {"answer": "no", "explanation": "Stubs and Mocks in PHPUnit can both verify method calls, though mocks are more commonly used for verification and behavior testing."} ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "The @dataProvider annotation is deprecated in PHPUnit 10+ in favor of the #[DataProvider] attribute." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "PHPUnit allows dependencies between tests using features like setUp(), setUpAfterReturning(), and dependencies injection." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "--randomize", ⏎   "explanation": "The --randomize option shuffles the order in which the tests are executed." ⏎ } ⏎ ```

```json ⏎ {"answer": "3-4", "explanation": "intdiv(7, 2) returns 3 and intdiv(-7, 2) returns -4, so the output is the concatenation of these two integers."} ⏎ ```

```json ⏎ {"answer": "9", "explanation": "The exponentiation operator (**) calculates -3 raised to the power of 2, which is (-3) * (-3) = 9."} ⏎ ```

```json ⏎ {"answer": "true", "explanation": "The expression '1e1' is equivalent to 10.0 in PHP, and '10' is implicitly cast to 10.0 for comparison, so they are equal."} ⏎ ```

```json ⏎ {"answer": "other", "explanation": "The switch statement compares the string 'a' to the case values. Since 'a' is not equal to 0, the default case is executed."} ⏎ ```

```json ⏎ {"answer": "1bc", "explanation": "strtr replaces 'a' with '1' and 'ab' with '2'. Since 'ab' is not found, only 'a' is replaced."} ⏎ ```

```json ⏎ {"answer": "[o]", "explanation": "The substr function extracts a part of a string. Here, it starts from the 10th character from the end ('-10') of 'hello' until the end, resulting in 'o', which is then enclosed in square brackets."} ⏎ ```

```json ⏎ {"answer": "k,n,m", "explanation": "The '+' operator merges arrays, overwriting duplicate keys from the left array, then array_keys extracts the keys, which are then joined by implode with a comma."} ⏎ ```

```json ⏎ {"answer": "zyx", "explanation": "The code sorts the array `$a` based on the third element of each sub-array in ascending order and then concatenates the second elements of the sorted array."} ⏎ ```

```json ⏎ {"answer": 4, "explanation": "The function f subtracts the value of the second argument from the first argument, and the code calls f with a=5 and b=1, resulting in 5 - 1 = 4."} ⏎ ```

```json ⏎ {"answer": "3", "explanation": "The code creates an instance of class P, calls the method g() which returns the value of the private variable v (which is 3), stores the callable method in the variable $f, then sets the variable $p to null, and finally calls the stored callable method $f()."} ⏎ ```

```json ⏎ {"answer": "B", "explanation": "The 'who()' method in class A returns the name of the class where it is called, which is B in this case because (new B) is instantiated."} ⏎ ```

```json ⏎ { ⏎   "answer": 10, ⏎   "explanation": "The code defines a class C with a property x. When x is set to 5, the setter method multiplies the value by 2, resulting in 10." ⏎ } ⏎ ```

```json ⏎ {"answer": "BA", "explanation": "The code uses traits TA and TB, both defining a function f(). Class TC uses both traits with renaming and overriding: TB's f() is used instead of TA's f(), and TA's f() is renamed to g(). Therefore, (new TC)->f() returns 'B' and (new TC)->g() returns 'A', resulting in the concatenation 'BA'."} ⏎ ```

```json ⏎ {"answer": "1", "explanation": "Traits share static properties between classes, so modifying CX::$n also modifies CY::$n because they both use the Counter trait."} ⏎ ```

```json ⏎ {"answer": "2", "explanation": "The finally block always executes, overriding the return value of the try block."} ⏎ ```

```json ⏎ { ⏎   "answer": "second", ⏎   "explanation": "The inner finally block throws a LogicException, which is caught by the outer catch block, and its message is echoed." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "App\\Baz|N\\Baz", ⏎   "explanation": "The code prints the fully qualified class name of `App\\Foo` aliased as `Baz` within the `N` namespace, and the fully qualified class name of `N\\Baz` itself, separated by a pipe." ⏎ } ⏎ ```

```json ⏎ {"answer": "yesyes", "explanation": "The code checks if the class 'Foo' exists in the current namespace 'Ns'. Both checks are true because the class 'Foo' is defined in the 'Ns' namespace."} ⏎ ```

```json ⏎ { ⏎   "answer": "1,2,99", ⏎   "explanation": "The foreach loop creates a reference to each element of the array. After the loop, the last referenced variable $v is reassigned, which modifies the last element of the original array." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 3, ⏎   "explanation": "The static variable `$n` in class `A` is shared among all instances of `A` and its subclasses (`B`). The first call to `$a->inc()` increments `$n` to 1. The call to `$b->inc()` increments `$n` to 2. The final call to `$a->inc()` increments `$n` to 3, which is then returned." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 11, ⏎   "explanation": "The generator function `g()` yields 1, then the `send()` method sends 10, which is assigned to `$x`. The function then returns `$x + 1`, which is 10 + 1 = 11." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "1,2,ok", ⏎   "explanation": "The outer generator yields the values from the inner generator and then yields the return value of the inner generator." ⏎ } ⏎ ```

```json ⏎ {"answer": "yesyes", "explanation": "The first call checks if the hash needs rehash with cost 4, which it doesn't. The second call checks if the hash needs rehash with cost 5, which it does because the cost is lower than the current one."} ⏎ ```

```json ⏎ {"answer": "strict-in", "explanation": "E_ALL is defined as 33554432, which is 2^25. 2048 is 2^11. The bitwise AND of 2^25 and 2^11 is 0. Therefore, the condition (E_ALL & 2048) === 0 is true, and the code outputs 'strict-in'."} ⏎ ```

```json ⏎ {"answer": "mapped", "explanation": "The code checks if the 'X-Token' header exists and its value is 'abc', which it does, so it outputs 'mapped'."} ⏎ ```

```json ⏎ {"answer": "CAB", "explanation": "Event listeners are executed based on their priority, with higher priority numbers executing later; the listeners are executed in the order of priority 5, default (0), 10, resulting in the output 'CAB'."} ⏎ ```

```json ⏎ {"answer": "same", "explanation": "Both $a and $b refer to the same entity object fetched from the EntityManager."} ⏎ ```

```json ⏎ {"answer": "0", "explanation": "The user is persisted and then immediately removed before the flush, so the table remains empty."} ⏎ ```

```json ⏎ {"answer": 2, "explanation": "The query counts the number of rows in the temporary table 't', which contains two rows."} ⏎ ```

```json ⏎ { ⏎   "answer": "10,30,60", ⏎   "explanation": "The query calculates the cumulative sum of the 'x' column ordered by 'id' and then concatenates these sums into a comma-separated string." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "M1M2", ⏎   "explanation": "The code dispatches a message through a MessageBus with two middleware instances (Trace). Each middleware echoes its tag before passing the envelope to the next middleware in the stack." ⏎ } ⏎ ```

```json ⏎ {"answer": 11, "explanation": "The code dispatches a 'Ping' message to a message bus configured with two handlers. The first handler increments the counter '$n' by 1, and the second handler increments it by 10. The final value of '$n' is the sum of these increments."} ⏎ ```

```json ⏎ { ⏎   "answer": "1", ⏎   "explanation": "The query inserts the value 1 into the temporary table 't'. The unique index prevents duplicate values, so the second insert is ignored by 'ON CONFLICT DO NOTHING'. The final select statement counts the number of rows in 't', which is 1." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 1, ⏎   "explanation": "The `UNIQUE` constraint is initially deferred, allowing duplicate inserts. The count is taken before the transaction commits, so the constraint is not yet enforced." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 6, ⏎   "explanation": "The command `phpunit CalcTest.php --filter test_sum` runs the tests annotated with `@DataProvider('prov')` twice, once for each test method (`test_sum` and `test_sum_abs`), resulting in 2 * 3 = 6 tests." ⏎ } ⏎ ```

```json ⏎ {"answer": "2, 1", "explanation": "The data provider 'prov' returns two datasets. The first dataset [1] will pass the assertion ($x > 0$ is true). The second dataset [-1] will fail the assertion ($x > 0$ is false). Therefore, 2 tests are ran, and 1 fails."} ⏎ ```

```json ⏎ {"answer": "POST", "explanation": "The `-d` option in curl specifies data to be sent in the body of the request, which is characteristic of the POST method."} ⏎ ```

```json ⏎ {"answer": "GET", "explanation": "The -G option in curl specifies that the request should be a GET request, and it appends the data provided by -d to the URL as a query string."} ⏎ ```

```json ⏎ { ⏎   "answer": "invalid_client", ⏎   "explanation": "The error code 'invalid_client' is returned when the client authentication fails, often due to an incorrect or non-existent client ID." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "fragment", ⏎   "explanation": "When response_type=token, the authorization server passes the access token in the URL fragment (#) of the redirect_uri." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 6, ⏎   "explanation": "The `default` filter replaces the `false` value with `2`, which is then multiplied by `3`." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "The template code `{{ 'a' ~ 1 + 2 }}` is valid Twig syntax and will not throw an exception." ⏎ } ⏎ ```

```json ⏎ {"answer": "1", "explanation": "The code validates an empty string against a NotBlank constraint, which results in one validation error."} ⏎ ```

```json ⏎ {"answer": "invalid", "explanation": "The form is created but not submitted, so it's initially invalid."} ⏎ ```

```json ⏎ {"answer": "same", "explanation": "The code registers a service 'a' as a public stdClass instance in a Symfony ContainerBuilder, compiles the container, and then retrieves the service twice, comparing their object IDs, which will be the same."} ⏎ ```

```json ⏎ { ⏎   "answer": "hi Bob!", ⏎   "explanation": "The code uses Symfony's ContainerBuilder to define parameters, including a 'message' parameter that references other parameters using placeholders, which are then resolved during compilation." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "960", ⏎   "explanation": "Bootstrap 5.3's `.container` class has a max-width of 960px at the `lg` (large) breakpoint, which starts at 992px." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "text-danger", ⏎   "explanation": "The `text-danger` class sets the text color to red (danger color) in Bootstrap 5.3." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 2, ⏎   "explanation": "The class `OrderService` in the Domain layer depends on classes from the Application layer (`PlaceOrder`) and the Infrastructure layer (`Db`), which violates the defined dependency rules." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": 2, ⏎   "explanation": "BillingService in the Domain layer depends on Application and Infrastructure layers, violating the rules." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "10,15", ⏎   "explanation": "The code creates a Money object with amount 10, adds another Money object with amount 5, and then prints the amount of the original object and the resulting object." ⏎ } ⏎ ```

```json ⏎ {"answer": 0, "explanation": "The code adds item 'a', then attempts to remove it. Since this is the only item, a DomainException is thrown and caught. The count is then called, which returns 0 because the item was effectively removed due to the exception handling, or potentially removed before the exception was thrown depending on the exact PHP version and error handling mechanism, but the final state is an empty items array."} ⏎ ```

```json ⏎ {"answer": "hi", "explanation": "The code creates an instance of class C and calls the hi() method, which returns the string 'hi'."} ⏎ ```

```json ⏎ { ⏎   "answer": "no", ⏎   "explanation": "The first call to isUninitializedLazyObject returns true because the lazy object hasn't been initialized yet. Accessing $o->v triggers the initialization, so the second call to isUninitializedLazyObject returns false." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yes", ⏎   "explanation": "Symfony\Component\\Security\\Guard\\AbstractGuardAuthenticator exists in Symfony 8.1." ⏎ } ⏎ ```

```json ⏎ { ⏎   "answer": "yesyes", ⏎   "explanation": "Both classes exist in Symfony 8.1." ⏎ } ⏎ ```