Hubspot Custom form submit using php

 <form method="post" action="">

            <div class="form-row">

               <div class="col-12 col-md-9 mb-2 mb-md-0">

                <input type="text" class="form-control form-control-lg" name="firstname" placeholder="Enter your Name">

              </div>

  

  <div class="col-12 col-md-9 mb-2 mb-md-0">

                <input type="email" class="form-control form-control-lg" name="emailval" placeholder="Enter your email...">

              </div>

              <div class="col-12 col-md-3">

                <button type="submit" name="submit" class="btn btn-block btn-lg btn-primary">Sign up!</button>

              </div>

            </div>

          </form>

  

  <?php 

  error_reporting(0);

$name2=$_REQUEST['firstname'];

$email2=$_REQUEST['emailval'];

if (isset($_POST['submit'])){

 $arr = array(

            'fields' => array(

                array(

                    'name' => 'email',

                    'value' => $email2

                ),

                array(

                    'name' => 'firstname',

                    'value' => $name2

                )

            )

        );

        $post_json = json_encode($arr);

        $endpoint = 'https://api.hsforms.com/submissions/v3/integration/submit/portalid/formguid';

        $ch = @curl_init();

        @curl_setopt($ch, CURLOPT_POST, true);

        @curl_setopt($ch, CURLOPT_POSTFIELDS, $post_json);

        @curl_setopt($ch, CURLOPT_URL, $endpoint);

        @curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));

        @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

        $response = @curl_exec($ch);

        $status_code = @curl_getinfo($ch, CURLINFO_HTTP_CODE);

        $curl_errors = curl_error($ch);

        @curl_close($ch);

        if($response == '{"inlineMessage":"Thanks for submitting the form."}'){

echo "Form Submit Successfully";

}

}

?>