- preg_match: documentation ( source)
- preg_last_error: documentation ( source)
- var_export: documentation ( source)
<?php
var_export(preg_match('~foo~', 'foo', $string));
var_export(preg_match('~foo~', 'bar', $string));
var_export(preg_match('~foo', 'foo', $string));
var_export(preg_last_error());