- filter_var: documentation ( source)
- strip_tags: documentation ( source)
<?php
$value = "Test tämä & 'tuo' <h1>test</h1> <?php testi ?> !#¤%&/()=?";
echo filter_var($value, FILTER_SANITIZE_STRING, FILTER_FLAG_NO_ENCODE_QUOTES);
echo strip_tags($value);