function karaktertemizle($deger) {
    $gecerliler=",q,w,e,r,t,y,u,i,o,p,a,s,d,f,g,h,j,k,l,z,x,c,v,b,n,m,0,1,2,3,4,5,6,7,8,9,_,";
    if (!empty($deger)) {
        $deger=trim(strtolower ($deger));

// turkish characters
        $deger=ereg_replace(" ","_",$deger);
        $deger=ereg_replace("ğ","g",$deger);
        $deger=ereg_replace("ü","u",$deger);
        $deger=ereg_replace("ş","s",$deger);
        $deger=ereg_replace("ı","i",$deger);
        $deger=ereg_replace("ç","c",$deger);
        $deger=ereg_replace("ö","o",$deger);
        $deger=ereg_replace("Ğ","g",$deger);
        $deger=ereg_replace("Ü","u",$deger);
        $deger=ereg_replace("Ş","s",$deger);
        $deger=ereg_replace("Ç","c",$deger);
        $deger=ereg_replace("Ö","o",$deger);
        $deger=ereg_replace("İ","i",$deger);
        $deger=ereg_replace("305","i",$deger);
        $deger=ereg_replace("214","o",$deger);
        $deger=ereg_replace("246","o",$deger);
        $deger=ereg_replace("252","u",$deger);
        $deger=ereg_replace("231","c",$deger);
        $deger=ereg_replace("199","c",$deger);
        $deger=ereg_replace("220","u",$deger);
        $deger=ereg_replace("304","i",$deger);
        $deger=ereg_replace("287","g",$deger);
        $deger=ereg_replace("351","s",$deger);
        $deger=ereg_replace("286","g",$deger);
        $deger=ereg_replace("350","s",$deger);
        $deger=ereg_replace("8217","",$deger);
        $deger=ereg_replace("8216","",$deger);
        $deger=ereg_replace("amp","",$deger);
        $deger=ereg_replace("ynt","",$deger);

// utf 8 turkish
        $deger=ereg_replace("Ä°","i",$deger);
        $deger=ereg_replace("Ö","o",$deger);
        $deger=ereg_replace("ö","o",$deger);
        $deger=ereg_replace("Ü","u",$deger);
        $deger=ereg_replace("Ç","c",$deger);
        $deger=ereg_replace("ç","c",$deger);
        $deger=ereg_replace("ü","u",$deger);
        $deger=ereg_replace("ı","i",$deger);
        $deger=ereg_replace("ÄŸ","g",$deger);
        $deger=ereg_replace("ÅŸ","s",$deger);
        $deger=ereg_replace("Äž","g",$deger);
        $deger=ereg_replace("Åž","s",$deger);
/*
// windows sunucular icin
        $deger=ereg_replace("%c4%b1","i",$deger);
        $deger=ereg_replace("%c3%b6","o",$deger);
        $deger=ereg_replace("%c3%96","o",$deger);
        $deger=ereg_replace("%c3%bc","u",$deger);
        $deger=ereg_replace("%c3%a7","c",$deger);
        $deger=ereg_replace("%c3%87","c",$deger);
        $deger=ereg_replace("%c3%9c","u",$deger);
        $deger=ereg_replace("%c4%b0","i",$deger);
        $deger=ereg_replace("%c4%9f","g",$deger);
        $deger=ereg_replace("%c5%9f","s",$deger);
        $deger=ereg_replace("%c4%9e","g",$deger);
        $deger=ereg_replace("%c5%9e","s",$deger);
*/

        $yeni="";
        for ($i=1; $i<=strlen($deger); $i++) {
            if (strpos($gecerliler,"," . substr($deger,$i-1,1) . ",")>0) { 
                $yeni=$yeni . substr($deger,$i-1,1); 
                }
        }
        $deger=$yeni;
    
        return $deger;
        
    }else {
        
        return ereg_replace("__","_",$deger);
    }
}