- str_replace: documentation ( source)
- preg_replace: documentation ( source)
<?php
$text = '¡ÉQuÁÉÍÓÚ fríoÍ!';
$text = str_replace(array('¡','Á','É','Í','Ó','Ú'), '', $text);
$text = preg_replace('/[^a-zA-Z0-9áéíóúñ\', ]/i','',$text);
echo $text;
die;