A simple PHP mail form with reCAPTCHA

This is some code snippets, to add a php mail form, with reCAPTCHA to your site.

Get your reCAPTCHA keys here: https://www.google.com/recaptcha


$recaptchaResponse = $_POST['g-recaptcha-response'];
$secretKey = "recaptcha secret key";
$request = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret={$secretKey}&response={$recaptchaResponse}&remoteip={$userIP}");
if(strstr($request, "true")){
$usermail = $_POST['usermail'];
$username = $_POST['username'];
$userphone = $_POST['userphone'];
$message = "New user:\r\n Name: " . $username . "\r\n Mail: " . $usermail . "\r\n Phone: " . $userphone;
$to = 'lasse@lasse-it.dk';
$from = 'php@lasse-it.dk';
$subject = 'New user';
$headers = 'From:' . $from . "\r\n" .
'Reply-To: ' . $from . "\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($to, $subject, $message, $headers);
header ( "Location: /" );
die ();


<script src='https://www.google.com/recaptcha/api.js'></script>
<form action="mail.php" method="post">
Full name:<br>
<input type="text" name="username">
<input type="text" name="usermail">
<input type="text" name="userphone">
<input type="submit" value="Submit">
<div class="g-recaptcha" data-sitekey=""></div>

Lasse Hyldahl Jensen on EmailLasse Hyldahl Jensen on GithubLasse Hyldahl Jensen on GoogleLasse Hyldahl Jensen on InstagramLasse Hyldahl Jensen on LinkedinLasse Hyldahl Jensen on Twitter
Lasse Hyldahl Jensen

One thought on “A simple PHP mail form with reCAPTCHA

  1. I’m a dummy with php, so I hope my question doesn’t sound too stupid ;-(
    I’ve created a html and a php file, I’ve copied/pasted the codes and entered the secret key (and adapted the e-mail address). But…it says unvalid site key/ the recaptcha doesn’t work. What did I do wrong; how can I improve it? Thanks in advance for your reaction!


Leave a Reply