PHP Cheatsheet
A comprehensive PHP and WordPress PHP quick-reference covering syntax, types, arrays, strings, functions, OOP, security, database access, HTTP, Composer, debugging, and WordPress APIs.
PHP Syntax and Runtime
Quick reference for PHP tags, comments, statements, control flow, operators, includes, headers, and runtime behavior.
Types, Comparisons, and Values
Quick reference for PHP scalar types, compound types, null, casting, truthiness, strict comparison, and WordPress value handling.
Arrays and Data Shaping
Quick reference for PHP indexed arrays, associative arrays, array functions, destructuring, sorting, filtering, and WordPress argument arrays.
Strings, Numbers, Dates, and Formatting
Quick reference for PHP string functions, interpolation, formatting, numbers, dates, localization, and WordPress-safe output.
Functions, Scope, Includes, and Namespaces
Quick reference for PHP functions, arguments, callbacks, closures, scope, includes, namespaces, and WordPress naming patterns.
Object-Oriented PHP
Quick reference for PHP classes, properties, methods, constructors, visibility, inheritance, interfaces, traits, enums, and WordPress OOP patterns.
Errors, Exceptions, Logging, and Debugging
Quick reference for PHP errors, exceptions, WordPress WP_Error, logging, debug constants, and production-safe troubleshooting.
Files, Uploads, Streams, and JSON
Quick reference for PHP file operations, WordPress filesystem helpers, upload handling, JSON encoding, and safe file paths.
Security, Validation, Sanitization, and Escaping
Quick reference for PHP and WordPress security, input validation, sanitization, escaping, nonces, capabilities, SQL safety, and file safety.
Database, SQL, PDO, and WordPress wpdb
Quick reference for PHP database access, PDO, SQL safety, WordPress wpdb, WP_Query, options, metadata, transients, and migrations.
HTTP, Sessions, Cookies, and APIs
Quick reference for PHP request data, headers, redirects, cookies, sessions, WordPress HTTP API, AJAX, REST, and remote integrations.
Composer, Autoloading, Testing, and Tooling
Quick reference for Composer, PSR-4 autoloading, WordPress coding standards, static analysis, testing, linting, and release tooling.
WordPress PHP API Cheatsheet
Comprehensive quick reference for WordPress PHP hooks, themes, plugins, queries, metadata, options, users, REST, AJAX, cron, media, i18n, WooCommerce, multisite, and debugging.