function guvenlik($q) { 
	$q = htmlspecialchars(stripslashes($q));
	$q = str_replace("script", "blocked", $q);
	$q = str_replace("select", "", $q);
	$q = str_replace("SELECT", "", $q);
	$q = str_replace("UPDATE", "", $q);
	$q = str_replace("update", "", $q);
	$q = str_replace("delete", "", $q);
	$q = str_replace("DELETE", "", $q);
	$q = str_replace("UNION", "", $q);
	$q = str_replace("union", "", $q);
	$q = str_replace('"', "", $q);
	$q = str_replace("%", "", $q);
	$q = mysql_escape_string($q);
	$q = str_replace("`","",$q);
	$q = str_replace("'","'",$q);
	$q = str_replace("-","-",$q);
	$q = str_replace("&","",$q);
	$q = str_replace("%","",$q);
	$q = str_replace("<","",$q);
	$q = str_replace(">","",$q);
	$q = trim($q);
	return $q; 
}

$adsoyad = guvenlik($_POST['adsoyad']); // Güvenli veri