Application of pure IP database IP address converted to decimal

$ip = $_SERVER['REMOTE_ADDR'];
echo 'Your IP:'.$ip.'<br />';
$ip_arr = explode(".",$ip);
$ip = 0;
foreach($ip_arr as $i=>$s){
$ip += $s*pow(256,3-$i);
}
echo 'Turn decimal value:'.$ip.'<br />';