<?php
function getLinkInfos($code, $key)
{
    $sequence_number = mt_rand(1,99999999999);
    $ch = curl_init("https://g.api.mega.co.nz/cs?id=".$sequence_number);

    $data = array(array("a" => "g", "p" => $code));
    $data_string = json_encode($data);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);

    $output = curl_exec($ch);

    $res = json_decode(curl_exec($ch),true);

    if(!isset($res[0]['s']) || !isset($res[0]['at']))
    {
        return false;
    }
    else
    {
        $key = base64_decode($key);

        $size = $res[0]['s'];
        $name = $res[0]['at'];

        // HOW TO DECRYPT "at" ?

        return array('size' => $size,
            'name' =>  $name );
    }
}

var_dump(getLinkInfos('KRgBQCaI', 'ay8OYmRbLSIokMioDWRPKjcdZDFNrubHZiMVqinNUmI'));