da lettere accentate a lettere normali.... à -> a

[brodik]

prova con

function remove_accents( $string ) {    
$string = htmlentities($string);    
return preg_replace("/&([a-z])[a-z]+;/i","$1",$string); 
}

$string = "òàà";
echo remove_accents( $string ); //oaa