Ayudándonos de la función ereg_replace podemos crearnos la siguiente función para eliminar las tildes.
function quitar_tildes ($div) { //esta funcion va a quitar los caracteres con tilde o cualquier acento $n_div=ereg_replace("á","a",$div); $n_div=ereg_replace("é","e",$n_div); $n_div=ereg_replace("í","i",$n_div); $n_div=ereg_replace("ó","o",$n_div); $n_div=ereg_replace("ú","u",$n_div); $n_div=ereg_replace("ä","a",$n_div); $n_div=ereg_replace("ë","e",$n_div); $n_div=ereg_replace("ï","i",$n_div); $n_div=ereg_replace("ö","o",$n_div); $n_div=ereg_replace("ü","u",$n_div); $n_div=strtolower($n_div); return $n_div; }