181. What is the purpose of PHP's Fibers in 8.1+?
- a) Lightweight cooperative multitasking
- b) Parallel thread execution
- c) Asynchronous I/O operations
- d) Both A and C
Answer: D - Fibers enable suspendable functions without full threading, ideal for async I/O.
182. Which PHP 8.2 feature improves type system expressiveness?
- a) DNF Types
- b) Generic Types
- c) Typed Properties
- d) Type Erasure
Answer: A - Disjunctive Normal Form types allow (A&B)|C type combinations.
183. What is the purpose of PHP's WeakMaps?
- a) Memory-efficient object-keyed maps
- b) Thread-safe array alternative
- c) Persistent storage
- d) Encrypted data structures
Answer: A - WeakMaps don't prevent garbage collection of their keys (unlike SplObjectStorage).
184. Which tool analyzes PHP memory usage in real-time?
- a) Meminfo
- b) Xdebug
- c) Blackfire
- d) Tideways
Answer: A - Meminfo provides detailed heap snapshots for memory leak detection.
185. What is the purpose of PHP's Attributes (annotations)?
- a) Structured metadata for classes/properties
- b) Documentation generation
- c) Runtime code modification
- d) All of the above
Answer: D - Attributes replace docblock annotations with first-class syntax.
186. Which PHP 8.3 feature improves JSON validation?
- a) json_validate()
- b) JSON_THROW_ON_ERROR
- c) json_parse()
- d) FilterJSON extension
Answer: A - New json_validate() function checks syntax without parsing.
187. What is the purpose of PHP's preloading in 7.4+?
- a) Loads classes into OPcache at startup
- b) Prefetches database results
- c) Compiles templates in advance
- d) Caches configuration files
Answer: A - Preloading reduces autoloading overhead for critical classes.
188. Which PHP 8.1 feature improves enum capabilities?
- a) Backed enums
- b) Enum methods
- c) Enum interfaces
- d) All of the above
Answer: D - PHP 8.1 enums support scalar values, methods, and interfaces.
189. What is the purpose of PHP's JIT in 8.0+?
- a) Compiles hot paths to machine code
- b) Just-In-Time dependency injection
- c) Dynamic typing
- d) Template compilation
Answer: A - JIT improves CPU-bound performance by native compilation.
190. Which tool visualizes PHP service dependencies in microservices?
- a) OpenTelemetry
- b) Zipkin
- c) Jaeger
- d) All of the above
Answer: D - All provide distributed tracing for service maps.
191. What is the purpose of PHP's #[SensitiveParameter] attribute?
- a) Redacts sensitive data in stack traces
- b) Encrypts parameter values
- c) Validates input sanitization
- d) Marks PII for GDPR compliance
Answer: A - Hides values (like passwords) in error logs (PHP 8.2+).
192. Which PHP 8.3 feature improves random number generation?
- a) Randomizer class
- b) random_bytes() enhancement
- c) CSPRNG extension
- d) SecureRandom interface
Answer: A - New Randomizer provides shuffle(), getBytes(), etc. methods.
193. What is the purpose of PHP's FFI in 7.4+?
- a) Calls C libraries directly
- b) Foreign function integration
- c) Both A and B
- d) JavaScript interoperability
Answer: C - Foreign Function Interface interacts with C code without extensions.
194. Which PHP 8.2 change improves type inference?
- a) Standalone null/false types
- b) Type widening
- c) Type narrowing
- d) All of the above
Answer: D - Allows more precise type annotations and checks.
195. What is the purpose of PHP's array_is_list() in 8.1+?
- a) Checks if array is a sequential list
- b) Validates array structure
- c) Converts objects to arrays
- d) Sorts associative arrays
Answer: A - Returns true for arrays with sequential 0-based integer keys.
196. Which PHP 8.3 feature improves class constant visibility?
- a) Typed constants
- b) Final constants
- c) Dynamic constant fetch
- d) All of the above
Answer: A - Constants can now have type declarations (e.g., const string FOO = 'bar').
197. What is the purpose of PHP's #[Override] attribute?
- a) Marks intentional method overrides
- b) Enforces polymorphism
- c) Both A and B
- d) Replaces abstract methods
Answer: C - Ensures parent class has matching method (PHP 8.3+).
198. Which PHP 8.2 feature deprecates dynamic properties?
- a) #[AllowDynamicProperties]
- b) StrictProperties mode
- c) declare(strict_properties=1)
- d) final class properties
Answer: A - Classes now forbid dynamic properties unless explicitly allowed.
199. What is the purpose of PHP's deep clone feature in 8.1+?
- a) Recursive object cloning
- b) __clone() method enhancement
- c) Serialized cloning
- d) Immutable object duplication
Answer: A - readonly properties can now be reinitialized during cloning.
200. Which PHP 8.3 feature improves unserialization security?
- a) Allowed classes list
- b) Serialized data validation
- c) unserialize() strict mode
- d) All of the above
Answer: A - New $allowed_classes parameter restricts unserialization targets.