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Most referenced — PHP

Migrating from PHP 5.x to PHP 7 and 8 2 max_execution_time & set_time_limit() 2 readonly Classes (PHP 8.2) 2 array_map / filter / reduce as FP Patterns 2 Spread Operator & Variadic Args (PHP 5.6) 2 PHP Version Upgrade Checklist 2 DateTimeImmutable vs DateTime 2 abstract (Classes & Methods) 2

Division by Zero & DivisionByZeroError 5 Exception Handling (try/catch/finally) 5 readonly Classes (PHP 8.2) 4 array_column() — Plucking Values from Arrays 3 PHP/FI — The Origin Story (1994–1997) 3 Error Handling in PHP 3 Arrow Functions (PHP 7.4) 3 realpath() 3

Undefined Array Key / Offset Errors 251Division by Zero & DivisionByZeroError 221Array Destructuring ([] = …) 219Type Coercion 202password_hash() — Native Bcrypt (PHP 5.5) 176Exception Handling (try/catch/finally) 151Type Declarations Overview 132allow_url_fopen / allow_url_include 122

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openssl_encrypt() PHP 7.1+

PHP's OpenSSL wrapper for symmetric encryption — use AES-256-GCM for authenticated encryption.

3mo ago php advanced

Output Buffering (ob_start / ob_flush) PHP 4.0+

Capturing PHP output into a buffer rather than sending it immediately, enabling manipulation before delivery or header modification.

3mo ago php intermediate

password_hash() PHP 5.5+

PHP's built-in function for securely hashing passwords using bcrypt or Argon2 with automatic salting.

3mo ago php beginner

password_verify() PHP 5.5+

Checks a plaintext password against a bcrypt/Argon2 hash produced by password_hash() — the correct way to validate passwords.

3mo ago php beginner

Diagram: PDO

PHP Data Objects — a database abstraction layer supporting prepared statements across multiple database drivers.

3mo ago php intermediate

PHAR Archives & Packaging PHP 5.2+

PHP's native archive format for self-contained distributable applications — like a JAR file for Java — with a bootstrap stub and compressed contents.

3mo ago php advanced

PHP CLI & Command-Line Scripts PHP 5.0+ 🧠 3

Running PHP from the command line for scripts, queue workers, cron jobs, and interactive tools — a distinct execution context from web requests.

3mo ago php beginner

PHP Data Types PHP 7.0+

PHP's eight primitive types — bool, int, float, string, array, object, callable, null — and how the type system coerces between them.

3mo ago php beginner

PHP Error Levels & error_reporting PHP 5.0+ 🧠 1

PHP's graduated error severity system from E_NOTICE to E_ERROR, controlled by error_reporting and display_errors INI directives.

3mo ago php intermediate

PHP Extensions Overview PHP 5.0+

PHP's functionality is extended via C extensions — bundled (PDO, cURL, mbstring) or PECL (Redis, Xdebug, Imagick) — loaded via php.ini.

3mo ago php intermediate

PHP FFI PHP 7.4+

Foreign Function Interface — allows PHP to call C library functions and use C data structures directly, enabling integration with native libraries without writing a PHP extension.

3mo ago php advanced

PHP Namespaces PHP 5.3+

Logical groupings that prevent class name collisions and form the basis of PSR-4 autoloading.

3mo ago php beginner

Diagram: PHP Preloading (opcache.preload)

PHP Preloading (opcache.preload) PHP 7.4+

Loading PHP files into shared memory at server start so every worker process gets pre-compiled bytecode with zero per-request filesystem overhead.

3mo ago php advanced

PHP References (&$var) PHP 5.0+

References allow multiple variables to point to the same value — powerful but a frequent source of hard-to-debug side effects.

3mo ago php intermediate

Diagram: PHP Session

PHP Session PHP 5.0+

Server-side storage keyed by a session ID cookie — the correct place to store authorisation state.

3mo ago php beginner

PHP Stream Wrappers PHP 5.0+

PHP's I/O abstraction layer — built-in wrappers like file://, php://, phar://, and http:// let file functions operate over any protocol.

3mo ago php advanced

Diagram: PHP-FPM

PHP-FPM PHP 5.3+ 🧠 3

PHP FastCGI Process Manager — a high-performance PHP process manager that manages worker pools for web servers like Nginx.

3mo ago php intermediate

php.ini Security Settings PHP 5.0+ 🧠 10

Critical php.ini directives that harden PHP applications by disabling dangerous features and restricting runtime behaviour.

3mo ago php intermediate

preg_match() / preg_replace() PHP 5.0+

PHP's PCRE regex functions — powerful but prone to ReDoS if patterns are not carefully constructed.

3mo ago php intermediate

Property Hooks (PHP 8.4) PHP 8.4+ 🧠 1

PHP 8.4 allows get and set hooks directly on class properties — replacing boilerplate getter/setter methods with inline logic on the property declaration.

3mo ago php intermediate

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