$box = array();
foreach($hedef_siteler as $hedef_site){
$ip=gethostbyname($hedef_site);
$box[$hedef_site] = $ip; 
}
foreach($box as $site=>$siteip){
if(count(array_keys($box,$siteip)>1){
//Birden Fazla
}else{
//Tek
}
}