docker-php-fpm/php_modules/spl/README.md

spl

The Standard PHP Library (SPL) is a collection of interfaces and classes that are meant to solve common problems.

SPL provides a set of standard datastructure, a set of iterators to traverse over objects, a set of interfaces, a set of standard Exceptions, a number of classes to work with files and it provides a set of functions like spl_autoload_register()

Platform	Url
PHP.net	https://www.php.net/manual/en/book.spl.php