pecl

PECL, or the PHP Extension Community Library, is a repository of PHP extensions that extend the functionality of the PHP language. It is part of the broader PHP ecosystem and operates alongside the core PHP distribution and the PEAR project. Extensions hosted on PECL are typically written in C and compiled into shared libraries, which PHP can load at runtime to provide additional features such as database drivers, caching mechanisms, image processing, and other capabilities not included in the core PHP distribution.

The PECL website, maintained at pecl.php.net, provides catalogs for available extensions, along with documentation, version history, and compatibility notes. Each extension is versioned to align with supported PHP releases. Users can manage extensions using the command-line pecl tool, which can search, download, compile, and install extensions. Installation usually requires PHP development headers and a C compiler. After installation, the extension must be enabled in PHP’s configuration (for example, via an extension directive in php.ini) and the interpreter or web server must be restarted.

PECL extensions are distributed independently of PHP itself, and not all extensions are actively maintained for every PHP version. Users should verify compatibility, licensing, and the extension’s maintenance status before deployment. PECL is distinct from the PEAR repository, which provides PHP libraries and applications rather than native extensions. Popular extensions available through PECL include imagick, redis, mongodb, memcached, and xdebug, among others.