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Most referenced — PHP
DateTimeImmutable vs DateTime 4Type Declarations Overview 3Readonly Classes (PHP 8.2) 3Iterators & IteratorAggregate 3allow_url_fopen / allow_url_include 2Migrating from PHP 5.x to PHP 7 and 8 2max_execution_time & set_time_limit() 2PHP SAPI Types (FPM, CLI, Embed) 2
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PHP/FI — The Origin Story (1994–1997)
PHP began in 1994 as Personal Home Page Tools — a set of Perl scripts Rasmus Lerdorf wrote to track visits to his online résumé. By 1995 it was rewritten in C, and PHP/FI (Forms Interpreter) 2.0 shipped in 1997 as the first publicly released version.
3mo ago
php beginner
Property Hooks (PHP 8.4)
PHP 8.4+
PHP 8.4 property hooks add get and set accessors directly to property declarations — eliminating the need for explicit getter/setter methods on simple value objects.
3mo ago
php advanced
readonly Classes (PHP 8.2)
PHP 8.2+
PHP 8.2 readonly classes make all promoted properties readonly automatically — the cleanest way to define immutable value objects and DTOs.
3mo ago
php beginner
readonly Properties (PHP 8.1)
PHP 8.1+
PHP 8.1 readonly properties can only be written once (in the constructor) — enforcing immutability without verbose accessor boilerplate.
3mo ago
php beginner
register_globals Era & Why It Was Dangerous
PHP 3.0+
PHP 4 shipped with register_globals=On by default — injecting GET/POST/COOKIE values as global variables, making PHP synonymous with insecurity until it was off-by-default in PHP 4.2.
3mo ago
php intermediate
Return Type Declarations (PHP 7.0)
PHP 7.0+
PHP 7.0 return type declarations (:int, :string, :void, :static, :never) enable functions to declare what they return — making return contract violations detectable at runtime and by static analysis.
3mo ago
php beginner
Safe Mode — What It Was & Why It Failed
PHP 3.0+
PHP's safe_mode (PHP 3–5.3) attempted to restrict multi-user PHP hosting at the language level — it was removed in PHP 5.4 after being proven ineffective and breaking legitimate code.
3mo ago
php intermediate
Scalar Type Declarations (PHP 7.0)
PHP 7.0+
PHP 7.0 added int, float, string, bool type declarations for function parameters — the biggest type safety leap in PHP history, enabling static analysis.
3mo ago
php beginner
Short Open Tags History & Why to Avoid
PHP 3.0+
PHP's short tags (<? ?> and <?= ?>) have been problematic since PHP 3 — disabled by many hosting providers, conflicting with XML, and inconsistent across environments.
3mo ago
php beginner
SimpleXML — Parsing XML in PHP
PHP 5.0+
SimpleXML provides the fastest way to read well-formed XML in PHP — simplexml_load_string() or simplexml_load_file() returns an object where elements are properties and attributes are array-accessed, requiring no tree traversal.
3mo ago
php beginner
Socket Programming with PHP
PHP 5.0+
PHP supports raw socket programming via the Sockets extension (socket_create) and stream sockets (stream_socket_client) — used for custom protocols, WebSocket servers, and network tools.
3mo ago
php advanced
SPL Introduction — Standard PHP Library
PHP 5.0+
SPL (Standard PHP Library, PHP 5.0) added data structures, iterators, and interfaces — SplStack, SplQueue, SplHeap, ArrayObject, and the Iterator/Countable interfaces.
3mo ago
php intermediate
Spread Operator & Variadic Args (PHP 5.6)
PHP 5.6+
PHP 5.6 added variadic functions (...$args) and argument unpacking ($array...) — replacing func_get_args() and call_user_func_array() with clean syntax.
3mo ago
php beginner
sprintf() — Format Strings in PHP
PHP 4.0+
sprintf() builds a string by substituting typed placeholders (%s, %d, %f, %05d) with values — safer and more expressive than string concatenation or interpolation for formatted output, especially for numbers, padding, and locale-independent formatting.
3mo ago
php beginner
Traits — Horizontal Reuse (PHP 5.4)
PHP 5.4+
PHP 5.4 traits enable horizontal code reuse — mixins for PHP classes that can't use multiple inheritance. Use sparingly; prefer composition over trait overuse.
3mo ago
php intermediate
Typed Class Constants (PHP 8.3)
PHP 8.3+
PHP 8.3 allows class, interface, and enum constants to declare an explicit type, catching type mismatches at definition time rather than at runtime when the constant is used.
3mo ago
php intermediate
Typed Properties (PHP 7.4)
PHP 7.4+
PHP 7.4 typed properties add type declarations to class properties — public string $name — preventing type mismatches and enabling full static analysis of object state.
3mo ago
php intermediate
Zend Engine Versions — 1 Through 4
The Zend Engine is the virtual machine that compiles and executes PHP code. Version 1 (PHP 3) introduced the modern parser; v2 (PHP 5) added OOP; v3 (PHP 7) doubled performance; v4 (PHP 8) added JIT compilation.
3mo ago
php intermediate
Accessing Undeclared Properties (PHP 8.2+)
PHP 8.2+
PHP 8.2 deprecated dynamic (undeclared) properties — PHP 9 will make them an error. Declare all properties explicitly or use AllowDynamicProperties.
3mo ago
php intermediate
ArgumentCountError — Wrong Arg Count
PHP 7.1+
PHP 7.1+ throws ArgumentCountError when too few arguments are passed to a function — too many arguments are silently ignored (unless using strict_types).
3mo ago
php beginner