Description:
------------
The documentation doesn't describe the fact that ini_get_all() may return false whether the given extension is invalid.

See: http://docs.php.net/manual/en/function.ini-get-all.php

Test script:
---------------
<?php
// @see https://3v4l.org/nmQoo
var_dump(ini_get_all('foobarbaz'));
/*
Warning: ini_get_all(): Unable to find extension 'foobarbaz' in /in/nmQoo on line 3
bool(false)
*/