Php terms
The engine behind the web's most-used server-side language
PHP powers an enormous portion of the web — from WordPress and Laravel to custom e-commerce platforms. This category covers the language internals, core functions, OOP features, type system, performance patterns, and PHP-specific quirks that every serious PHP developer should understand deeply. Whether you are writing procedural scripts or building full-stack applications with modern PHP 8.x features, these terms form the foundation.
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Most referenced — PHP
Undefined Array Key / Offset Errors 3Exception Handling (try/catch/finally) 3PHP 5 OOP Revolution — Objects by Reference 2PCNTL Signals in CLI PHP 2Abstract readonly Properties 2Fibers — Cooperative Concurrency (PHP 8.1) 2.env Files & Environment Variables 2PHP End-of-Life Schedule & Security Implications 2
Division by Zero & DivisionByZeroError 4PDOStatement::bindParam() vs bindValue() 3password_hash() — Native Bcrypt (PHP 5.5) 2Undefined Array Key / Offset Errors 2DI Containers — PHP-DI, Symfony & Laravel Compared 2Magic Methods (__get, __set, __call…) 2serialize() / unserialize() 2Fiber-Based Task Scheduler 2
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array_map / filter / reduce as FP Patterns PHP 5.3+
PHP's array_map(), array_filter(), and array_reduce() enable functional-style data transformation pipelines — cleaner than imperative loops for many common patterns.
2mo ago
php intermediate
Arrow Functions fn() => (PHP 7.4) PHP 7.4+
PHP 7.4 arrow functions (fn($x) => $x * $factor) are short closures that automatically capture outer scope — no more use($var) boilerplate.
2mo ago
php beginner
Attributes #[] Replacing Docblock Annotations PHP 8.0+
PHP 8.0 native attributes (#[Route('/home')]) replace fragile DocBlock @annotations — they're syntactically valid, parseable without reflection hacks, and supported by IDEs and static analysis.
2mo ago
php intermediate
Copy-on-Write (CoW) in PHP Arrays PHP 7.0+
PHP arrays are not copied when assigned or passed to functions — they share the same internal buffer until one copy is modified. Only then does PHP perform a real copy. This makes reading large arrays cheap but silent mutations expensive.
2mo ago
php intermediate
create_function() — The Dynamic Code Smell PHP 4.0+
create_function() created anonymous functions from strings — deprecated PHP 7.2, removed PHP 8. It used eval() internally, risked code injection, and was always replaceable with proper closures.
2mo ago
php intermediate
Cross-Version Compatibility Testing PHP 7.0+
Testing PHP code across multiple versions uses CI matrix builds, phpenv/phpbrew, Docker multi-version setups, and static analysis to catch compatibility issues before deployment.
2mo ago
php intermediate
DateTimeImmutable vs DateTime PHP 5.5+
DateTimeImmutable returns a new object for every modification — the original is never changed. DateTime modifies in place. Prefer DateTimeImmutable in all new code to avoid subtle bugs where shared date objects are accidentally mutated.
2mo ago
php beginner
Debugging PHP PHP 5.0+
Systematic techniques for finding and fixing PHP bugs — from var_dump and error logs to Xdebug step-debugging, with the guiding principle of narrowing down where incorrect behaviour first appears.
2mo ago
php beginner
DI Containers — PHP-DI, Symfony & Laravel Compared PHP 7.4+
A Dependency Injection container automates wiring of class dependencies — instead of manually constructing objects and their dependencies, the container reads type hints and builds the full object graph. PHP-DI, Symfony's DIC, and Laravel's service container are the main options.
2mo ago
php intermediate
DNF Types (PHP 8.2) PHP 8.2+
PHP 8.2 DNF (Disjunctive Normal Form) types allow unions of intersections — (Countable&Iterator)|null — combining PHP 8.1 intersection types with union types.
2mo ago
php advanced
DOMDocument & XPath in PHP PHP 5.0+
PHP's DOMDocument extension parses HTML and XML into a traversable tree. Combined with DOMXPath, you can query the document with XPath expressions — far more powerful than regex for extracting data from HTML.
2mo ago
php intermediate
each() & list() — Deprecated Iteration PHP 3.0+
each() was deprecated in PHP 7.2 and removed in PHP 8 — replace while(list($k,$v)=each($arr)) with foreach. list() itself is still valid as [] destructuring.
2mo ago
php beginner
Engine Exceptions — Error Hierarchy (PHP 7.0) PHP 7.0+
PHP 7.0 made fatal engine errors catchable as Error subclasses — TypeError, ParseError, ArithmeticError, DivisionByZeroError — via the shared Throwable interface.
2mo ago
php intermediate
Enums — First-Class Enumerations (PHP 8.1) PHP 8.1+
PHP 8.1 native enums replace class constant hacks — providing type-safe, enumerable, matchable values with optional backing values (: string or : int).
2mo ago
php intermediate
ereg() / eregi() — POSIX Regex Removed in PHP 7 PHP 3.0+
ereg() and eregi() were POSIX regex functions removed in PHP 7.0 — replace with preg_match() (PCRE) which is faster, more powerful, and the standard since PHP 4.
2mo ago
php beginner
Error Logging PHP 4.0+
Recording application errors, exceptions, and diagnostic information to persistent storage — essential for diagnosing production issues where display_errors must be off and errors are invisible to users.
2mo ago
php beginner
Error Reporting & Display PHP 4.0+
PHP's error_reporting level and display_errors directive control which errors are shown and where — development needs E_ALL with display on; production needs E_ALL with display off and logging on.
2mo ago
php beginner
Exception Handling Introduced (PHP 5) PHP 5.0+
PHP 5 introduced try/catch/finally and the Exception class — replacing PHP 4's procedural error handling with structured exception-based patterns.
2mo ago
php beginner
FFI — Foreign Function Interface (PHP 7.4) PHP 7.4+
PHP 7.4 FFI allows calling C functions and accessing C data structures directly from PHP — enabling Python-like ctypes integration for native libraries without writing C extensions.
2mo ago
php advanced
Fibers — Cooperative Concurrency (PHP 8.1) PHP 8.1+
PHP 8.1 Fibers enable cooperative multitasking — suspending execution at yield points and resuming later — the foundation for async PHP frameworks without OS threads.
2mo ago
php advanced