Reverse Ip Lookup

<?php
// Coded By ./EcchiExploit
error_reporting(0);
    function curl($url){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "https://domains.yougetsignal.com/domains.php");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, "remoteAddress=$url&key=&_=");
        curl_setopt($ch, CURLOPT_POST, 1);
        $exe = curl_exec($ch);
        curl_close($ch);
        return $exe;
    }
    $site = curl(readline("Your Site : "));
    $json = json_decode($site, true);
    foreach ($json['domainArray'] as $key) {
        echo "Success => ".$key[0]."\n";
        $save  = fopen("result.txt", "a+");
        fwrite($save, $key['0']."\n");
        fclose($save);
    }
?>