contact.php

<?php
require_once('display_fns.php');

display_header();

function isValid() 
{
    try {

        $url = 'https://www.google.com/recaptcha/api/siteverify';
        $data = ['secret'   => '[6Ld5bAkUAAAAAN0BV0H6YnjEpksBIGsGZakEBL85]',
                 'response' => $_POST['g-recaptcha-response'],
                 'remoteip' => $_SERVER['REMOTE_ADDR']];

        $options = [
            'http' => [
                'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
                'method'  => 'POST',
                'content' => http_build_query($data) 
            ]
        ];

        $context  = stream_context_create($options);
        $result = file_get_contents($url, false, $context);
        return json_decode($result)->success;
    }
    catch (Exception $e) {
        return null;
    }
}

echo "<div id='container'>";
echo '<p><img src="images/newsgoldbullet.gif" border="0"style="margin-left: 0px"><b>Contact</b></p>';
echo "<p> If you have questions or comments about our application that we provide, we would be pleased to hear from you!</p>";
echo "<form action='contact.php' method='POST'>";
echo "<span>Name</span></br>";
echo "<input type='text' name='userName' size='35'/></br>";
echo "<span>Your email address (optional)</span></br>";
echo "<input type='text' name='userEmail' size='35'/></br>";
echo "<span>Subject</span></br>";
echo "<input type='text' name='userSubject' size='35'/></br>";
echo "<span>Message</span></br>";
echo "<textarea rows=12 cols=50 name='userMessage'></textarea></br></br>";
echo "<span>Please click below</span></br>";
echo "<div class='g-recaptcha' data-sitekey='6Ld5bAkUAAAAACCsl45X83H6YyJM2xf2dg6dcKdS'></div><br/>";
echo "<input type='submit' name='userSubmit'/>";

echo "</form>";

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

  if (isValid()==false){ echo "<p><b>You need to click to prove that you are not robot! </p>"; }  

  else if((!empty($_POST['userName']))&&(!empty($_POST['userMessage']))&&(!empty($_POST['userSubject']))){
      $to_email = 'schmidtc@udel.edu';
      $subject = test_input($_POST['userSubject']);
      $subject = '[WebGIVI contact] '.$subject.'--'.test_input($_POST['userName']);
      $message = test_input($_POST['userMessage']);
      $userEmail = test_input($_POST['userEmail']);
      if (!empty($userEmail)){
         $headers = 'From:'.$userEmail."\r\n".'Reply-To:'.$userEmail."\r\n".'X-Mailer: PHP/' . phpversion();
         mail($to_email, $subject, $message,$headers);
      }

      else{
        $to_email = $to_email; // dummy line because the next line is commented out. -- ASHIQUE
        mail($to_email, $subject, $message);
        }
     echo "<p><b>Thanks for your question, we will contact you as soon as possible!</b></p>"; 
  }
  else{
    echo "<p><b>You forgot to input your name or subject or mesage!</b></p>";
  }
}

echo "</div>";
display_footer();
?>