Discord webhook bypass

<?php
   $inputJSON = file_get_contents('php://input');
   $input = json_decode($inputJSON, TRUE);

   $data = array("content" => $input["content"]);
   $data_string = json_encode($data);

   $ch = curl_init($input["webhook"]);
   curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
   curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   curl_setopt($ch, CURLOPT_HTTPHEADER, array(
       'Content-Type: application/json',
       'Content-Length: ' . strlen($data_string))
   );

   $result = curl_exec($ch);