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Most referenced — PHP
password_hash() — Native Bcrypt (PHP 5.5) 2Undefined Array Key / Offset Errors 2MySQL charset=utf8mb4 2PDO Fetch Modes 2PDO Named Placeholders 2PDO lastInsertId() 2PDO Transactions 2PDO Error Handling 2
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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.
3mo ago
PHP advanced
File Permissions
PHP 4.0+
Unix permission bits (owner/group/world read-write-execute) that control which processes can read, write, or execute files — misconfigured permissions are a common PHP deployment and security issue.
3mo ago
PHP beginner
Generators & yield (PHP 5.5)
PHP 5.5+
Generators (PHP 5.5) use yield to produce values lazily — enabling memory-efficient iteration over large datasets without loading everything into memory.
3mo ago
PHP intermediate
Global Function Style vs OOP Evolution
PHP 4.0+
PHP 4's procedural global-function style evolved into PHP 5 OOP — understanding the transition explains why modern PHP has both paradigms and how to migrate legacy procedural code.
3mo ago
PHP beginner
Guzzle HTTP Client
PHP 7.2+
Guzzle is PHP's most popular HTTP client library — providing a clean API for making synchronous and asynchronous HTTP requests, handling middleware, retries, authentication, and multipart uploads, with PSR-7 and PSR-18 compliance.
3mo ago
PHP intermediate
Intersection & DNF Types in Practice
PHP 8.1+
PHP 8.1 intersection types (A&B) and PHP 8.2 DNF types ((A&B)|null) allow precise type constraints for objects implementing multiple interfaces.
3mo ago
PHP advanced
JIT Compiler Introduction (PHP 8.0)
PHP 8.0+
PHP 8.0's JIT (Just-In-Time) compiler compiles hot bytecode to native machine code at runtime — significant gains for CPU-bound tasks, minimal gains for typical web requests.
3mo ago
PHP advanced
json_validate() — Native JSON Validation (PHP 8.3)
PHP 8.3+
2
PHP 8.3 added json_validate() — a dedicated function that checks whether a string is valid JSON without decoding it, making validation faster and cheaper than json_decode() + error checking.
3mo ago
PHP beginner
Late Static Binding — PHP 5.3 Feature
PHP 5.3+
static:: (Late Static Binding, PHP 5.3) refers to the called class at runtime — unlike self:: which always refers to the class where the method is defined.
3mo ago
PHP intermediate
match Expression (PHP 8.0)
PHP 8.0+
PHP 8.0's match is a stricter switch — uses strict (===) comparison, each arm is an expression (not statements), returns a value, and throws UnhandledMatchError if no arm matches.
3mo ago
PHP beginner
mb_string — Multibyte String Functions
PHP 4.0+
2
PHP's native string functions operate on bytes, not characters. The mb_string extension provides mb_strlen(), mb_substr(), mb_strtolower() and 100+ equivalents that correctly handle multibyte encodings like UTF-8.
3mo ago
PHP intermediate
mcrypt Deprecation — Migrate to OpenSSL
PHP 5.0+
mcrypt was deprecated in PHP 7.1 and removed in PHP 7.2 — migrate all encryption to OpenSSL (openssl_encrypt) or libsodium (sodium_crypto_secretbox).
3mo ago
PHP intermediate
Memory Exhaustion
PHP 4.0+
1
PHP's Allowed Memory Size Exhausted fatal error — caused by loading too much data into memory at once, unbounded loops accumulating objects, or memory leaks in long-running processes.
3mo ago
PHP intermediate
Migrating from PHP 4 to PHP 5
PHP 4.0+
PHP 4→5 migration: objects now pass by reference, add visibility (public/protected/private), replace var with typed properties, fix object assignment semantics, and adopt try/catch.
3mo ago
PHP intermediate
Migrating from PHP 7 to PHP 8
PHP 7.0+
PHP 7→8 migration: fix type coercion changes (stricter), remove deprecated functions (each(), create_function()), update match/constructor promotion, check third-party compatibility.
3mo ago
PHP intermediate
Named Arguments (PHP 8.0)
PHP 8.0+
PHP 8.0 named arguments let you pass values by parameter name — skipping optional params, self-documenting calls, and enabling out-of-order argument passing.
3mo ago
PHP beginner
Named Arguments in Attributes
PHP 8.1+
PHP 8.1+ allows named arguments inside attribute constructors — #[Route(path: '/home', methods: ['GET'])] — making attribute usage self-documenting.
3mo ago
PHP intermediate
new in Initializers (PHP 8.4)
PHP 8.4+
PHP 8.4 allows 'new ClassName()' expressions in default parameter values, attribute arguments, and static property initialisers — removing the need for null defaults combined with late assignment in constructors.
3mo ago
PHP intermediate
Null Coalescing ?? Operator (PHP 7.0)
PHP 7.0+
PHP 7.0's ?? operator returns the left side if it exists and isn't null, otherwise the right — replacing isset($x) ? $x : $default with $x ?? $default.
3mo ago
PHP beginner
Null Reference Errors
PHP 5.0+
Errors caused by calling methods or accessing properties on null — PHP's 'Call to a member function X() on null' and JavaScript's 'Cannot read properties of null' are the most common runtime errors in both languages.
3mo ago
PHP beginner