ş ğ ç lerden kaçma

<?php

if ($checkbox=='1') {
if ($_FILES['userfile']['name']) {

	$fileName   = $_FILES['userfile']['name'];
	$fadi_s = trsil($fileName);
	$uploadPath = "$THIS_DIR/$fadi_s";
	if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadPath)) {
			print "<p>Your file <b>$fileName</b> uploaded successfully.</p><br/>\n";
					} else {
		print "<p>There was a problem uploading your file <b>$fileName</b>.</p><br/>\n";
	}
}

?>

function trsil($q) { 
$q = str_replace("ç","c",$q); 
$q = str_replace ("ç","c",$q); 
$q = str_replace ("ğ","g",$q); 
$q = str_replace ("İ","I",$q); 
$q = str_replace ("ı","i",$q); 
$q = str_replace ("ş","s",$q); 
$q = str_replace ("ö","o",$q); 
$q = str_replace ("ü","u",$q); 
$q = str_replace ("Ü","U",$q); 
$q = str_replace ("Ç","c",$q); 
$q = str_replace ("Ğ","g",$q); 
$q = str_replace ("Ş","S",$q); 
$q = str_replace ("Ö","O",$q); 
$q = str_replace (" ","_",$q); 
$q = str_replace ("'","",$q); 
 return $q; 
} 


function guvenlik($q) { 
 $q = str_replace("`","",$q); 
 $q = ereg_replace("=","",$q); 
 $q = ereg_replace("&","",$q); 
 $q = ereg_replace("%","",$q); 
 $q = ereg_replace("!","",$q); 
 $q = ereg_replace("#","",$q); 
 $q = ereg_replace("<","",$q); 
 $q = ereg_replace(">","",$q); 
 $q = ereg_replace("*","",$q); 
 $q = ereg_replace("/","",$q); 
 $q = ereg_replace("?","ı",$q); 
 $q = ereg_replace("'","",$q); 
 $q = strtolower($q); 
 $q=trim($q); 
 return $q; 
}

$q = strtr($q, "ıIİĞğÜŞİÖöÇ窺ü", "iiiggusiooccssu");
$q = strtolower($q);

function c($deger) {
$turkce=array("ç","ş","ö","ü","ı");
$duzgun=array("c","s","o","u","i");
$deger=strtolower($deger);
$deger=str_replace($turkce,$duzgun,$deger);
return $deger;
}