PHP Manual
This manual is provided as a courtesy. It is not an official source. Please check php.net for updated information.
SPL is a collection of interfaces and classes that are meant to solve standard problems.
Tip: A more detailed documentation of SPL can be found here.
This extension is available and compiled by default in PHP 5.
The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.