function caesar_seo($deger) {
 $bozuk=array(" ","ı","İ","ş","Ş","ö","Ö","ü","Ü","ç","Ç","&","_#350;","_#305;","'","\"","_#287;","?","%","#8217;");
 $duzgun=array("-","i","I","s","S","o","O","u","U","c","C","_","","","","","","","","");
 $metin=url_decode($deger);
 $metin=str_replace($bozuk,$duzgun,$metin);
 return $metin;
}
$link="Şerafettin abi İyimisin.html";
echo caesar_seo($link);