vivo.sx api get file informations php

<?php
//this will get infomations of the vivo.sx file
//original Link: https://vivo.sx/a1b2c4d5e5
//file id: a1b2c4d5e6
//you can get the infos from up to 25 file-id's by adding ',' between the id's
//Like: $file_id = "a1b2c4d5e6,a4b4c4d4e4,c1c2c4c5c5";
$file_id = "a1b2c4d5e6";
$method = "GET";
$url = "https://vivo.sx/api/v1/files/".$file_id;
$api_key = "myLongKey123456789";
$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => $url,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => $method,
  CURLOPT_POSTFIELDS => "",
  CURLOPT_HTTPHEADER => array(
    "cache-control: no-cache",
    "content-type: application/json",
    "X-AUTH: $api_key"
  ),
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
  	echo "cURL Error #:" . $err;
} else {
    echo $response;
}
//more info on https://vivo.sx/api
?>