- preg_match: documentation ( source)
- htmlentities: documentation ( source)
- explode: documentation ( source)
<?php
$e=explode(".","../image.jpg");
echo count($e);
echo $e[1];
echo $e[2];
echo htmlentities("image.jpg</sript>");
echo "lala";
if (preg_match('/^[a-zA-Z0-9_-]+$/',"hello")==false) echo "falsch";
?>