Today, We want to share with you how to add captcha in php registration form.In this post we will show you how to validate captcha in php, hear for how to add google captcha in php registration form we will give you demo and example for implement.In this post, we will learn about Simple PHP Create Custom Captcha Generator with an example.

Implementation of Captcha in Registration Form in PHP

Contents

Step 1: Create Table In DB by Sql Query

CREATE TABLE `visitors1` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(30) NOT NULL,
  `email` varchar(100) NOT NULL,
  `password` varchar(250) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Step 2: Create a Database Connection PHP File

<?php
    $servername='localhost';
    $username='root';
    $password='';
    $dbname = "pakainfo_demo";
    $conn=mysqli_connect($servername,$username,$password,"$dbname");
      if(!$conn){
          die('Could not Connect MySql Server:' .mysql_error());
        }
?>

Step 3: Register your website on Google Re captcha and Get All Details

To add google recaptcha to your website you need to register your website here Google captcha Link: https://www.google.com/recaptcha/admin .Then get your site key and secret key.about:blank

Step 4: Create User Registration Form with Captcha Validation In PHP

<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <title>How to Add Captchacode in PHP Registration Form</title>
        <!-- CSS -->
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
        <script src="https://www.google.com/recaptcha/api.js" async defer></script>
    </head>
<body>
<div class="container mt-5">
    <div class="card">
        <div class="card-header text-center">
            Add Google Captchacode in PHP Registration Form
        </div>
        <div class="card-body">
            <form action="validate-captcha.php" method="post">
                <div class="form-group">
                    <label for="simpleDemoWithFun">Name</label>
                    <input type="text" name="name" class="form-control" id="name" required="">
                </div>                                
                <div class="form-group">
                    <label for="simpleDemoWithFun">Email location</label>
                    <input type="email" name="email" class="form-control" id="email" aria-describedby="emailHelp" required="">
                    <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
                </div>
                <div class="form-group">
                    <label for="simpleDemoWithFun">Password</label>
                    <input type="password" name="password" class="form-control" id="password" required="">
                </div>                   
                <div class="form-group">
                    <label for="simpleDemoWithFun">Confirm Password</label>
                    <input type="password" name="cpassword" class="form-control" id="cpassword" required="">
                </div>   
                <div class="g-recaptcha" data-sitekey="Your Site Key"></div>
                <input type="submit" name="password-reset-token" class="btn btn-primary">
            </form>
        </div>
    </div>
</div>
</body>
</html>

Step 5: Create PHP File to Check Captchacode and Save User Details

<?php
if(isset($_POST['submit']) && $_POST['g-recaptcha-response']!="")
{
    include "db.php";
    $secret = 'You Site 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)
    {
        $name = $_POST['name'];
        $email = $_POST['email'];
        $pass = $_POST['password'];
        mysqli_query($conn, "INSERT INTO visitors(name, email ,password) VALUES('" . $_POST['name'] . "', '" . $_POST['email'] . "', '" . md5($_POST['password']) . "')");
        echo "Visitor registration form with captchacode validation has been successfully saved";
    }
}

I hope you get an idea about how to add captchacode in php login form.
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Implementation of Captcha in Registration Form in PHP

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