- var_dump: documentation ( source)
- filter_var: documentation ( source)
<?php
var_dump(FILTER_FLAG_NO_ENCODE_QUOTES, FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH, FILTER_FLAG_ENCODE_AMP);
var_dump(filter_var('\\%éde_DE;ö#!\n', FILTER_SANITIZE_STRING));