- var_dump: documentation ( source)
- trim: documentation ( source)
- preg_replace: documentation ( source)
<?php
$s = "hé \r\n\t\xC2\xA0";
var_dump($s);
var_dump(trim($s));
var_dump(preg_replace('/^\s+|\s+$/', '', $s));
var_dump(preg_replace('/^\s+|\s+$/u', '', $s));