- var_dump: documentation ( source)
- strpos: documentation ( source)
- strripos: documentation ( source)
- strrpos: documentation ( source)
- stripos: documentation ( source)
<?php
var_dump(strpos('test', ''));
var_dump(stripos('test', ''));
var_dump(strrpos('test', ''));
var_dump(strripos('test', ''));