Reemplazar tildes

function limpiar_acentos($s)
{
$s = ereg_replace(”[áàâãª]”,”a”,$s);
$s = ereg_replace(”[ÁÀÂÃ]”,”A”,$s);
$s = ereg_replace(”[ÍÌÎ]”,”I”,$s);
$s = ereg_replace(”[íìî]”,”i”,$s);
$s = ereg_replace(”[éèê]”,”e”,$s);
$s = ereg_replace(”[ÉÈÊ]”,”E”,$s);
$s = ereg_replace(”[óòôõº]”,”o”,$s);
$s = ereg_replace(”[ÓÒÔÕ]”,”O”,$s);
$s = ereg_replace(”[úùû]”,”u”,$s);
$s = ereg_replace(”[ÚÙÛ]”,”U”,$s);
$s = str_replace(”ç”,”c”,$s);
$s = str_replace(”Ç”,”C”,$s);
$s = str_replace(”[ñ]”,”n”,$s);
$s = str_replace(”[Ñ]”,”N”,$s);
 
return $s;
}