PHP Manual

This is the official documentation and reference website for the PHP programming language, providing comprehensive language documentation, function references, migration guides, security advisories, and community resources for millions of developers worldwide who build web applications using one of the most widely deployed server-side programming languages. The function reference documents thousands of built-in PHP functions organized by extension categories including string manipulation, array operations, database access, file system operations, network protocols, cryptography, date and time processing, regular expressions, and hundreds of specialized extensions, with each function entry providing syntax, parameter descriptions, return values, error conditions, version compatibility, changelog entries, and user-contributed notes with practical examples. The language reference covers fundamental PHP concepts including variables and types, operators, control structures, functions, classes and objects, namespaces, exceptions, generators, attributes, fibers, and type system features, explaining semantics and behavior with code examples that demonstrate correct usage patterns. The migration guides provide detailed instructions for upgrading between PHP versions, documenting new features, deprecated functionality, backward compatibility breaks, and configuration changes for each major release. The security section provides guidance on common web application vulnerabilities including SQL injection, cross-site scripting, session fixation, and authentication, with practical mitigation strategies. The installation and configuration documentation covers all major platforms and web server combinations. The community resources link to package repositories and frameworks. Designed for PHP developers, web developers, system administrators, and programming students.