- var_dump: documentation ( source)
- strip_tags: documentation ( source)
<?php
$s=<<<FOO
<script>if (i<j.length);</script>
hola<a href="foo">demo</a>
<script>
/* <![CDATA[ */
/* ]]> */
if(a>2);
</script>
demo
bar
FOO;
var_dump(strip_tags( $s, '<a>' ));