basic contact form with recaptcha

[deleted]

create a file with named send_form_email.php
put the below codes, make your changes and upload file to your site root.

-add your reCAPTCHA v2 site secret key, if you don't have, create here
-add your mail address
-add your site

<?php
 
  if(isset($_POST['g-recaptcha-response']) && !empty($_POST['g-recaptcha-response']))
  {
        $secret = 'recaptcha secret key';
        $verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);
        $responseData = json_decode($verifyResponse);
        if($responseData->success)
        {
            $succMsg = 'Your contact request have submitted successfully.';
        }
        else
        {
            $errMsg = 'Robot verification failed, please try again.';
        }
   }
if(isset($_POST['email'])) {
 
    // EDIT THE 2 LINES BELOW AS REQUIRED
    $email_to = "your@mail.com";
    $email_subject = "Your email subject line";
 
    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }
 
 
    // validation expected data exists
    if(!isset($_POST['first_name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['telephone']) ||
        !isset($_POST['comments'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }
 
     
 
    $first_name = $_POST['first_name']; // required
    $email_from = $_POST['email']; // required
    $telephone = $_POST['telephone']; // not required
    $comments = $_POST['comments']; // required
 
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
 
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
 
    $string_exp = "/^[A-Za-z .'-]+$/";
 
  if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
 
 
  if(strlen($comments) < 2) {
    $error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }
 
  if(strlen($error_message) > 0) {
    died($error_message);
  }
 
    $email_message = "Form details below.\n\n";
 
     
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
 
     
 
    $email_message .= "First Name: ".clean_string($first_name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Telephone: ".clean_string($telephone)."\n";
    $email_message .= "Comments: ".clean_string($comments)."\n";
 
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>
 
<!-- include your own success html here -->
 
Thank you for contacting us. We will be in touch with you very soon.
Redirecting to mainpage.
<meta http-equiv="refresh" content="3;url=https://yoursite.com/" />
<?php
 
}
?>

create a page with fof pages
set enable to html put the below codes, make your changes.

-add your site
-add your reCAPTCHA v2 site key

<center><form name="contactform" method="post" action="https://yoursite.com/send_form_email.php"><label for="first_name">Name *</label>
<input  type="text" name="first_name" maxlength="50" size="30">
<label for="email">Email Address *</label>
<input  type="text" name="email" maxlength="80" size="30">
<label for="telephone">Telephone Number</label>
<input  type="text" name="telephone" maxlength="30" size="30">
<label for="comments">Comments *</label>
<textarea  name="comments" maxlength="1000" cols="80" rows="6"></textarea>

<div id="g-recaptcha-container"></div><script src="https://www.google.com/recaptcha/api.js?onload=recaptchaCallback&render=explicit" async defer></script><script>function recaptchaCallback (e) {
  var container = document.getElementById('g-recaptcha-container')
  container.innerHTML = ''
  var recaptcha = document.createElement('div')
  grecaptcha.render(recaptcha, {
    'sitekey': 'recaptcha site key'
  })
  container.appendChild(recaptcha)
}</script>
<input type="submit" value="Submit"><center>

i just edited and added to reCAPTCHA feature.
original codes here: https://www.freecontactform.com/email_form.php