Codeigniter 4 Google ReCaptcha V2 Example

Codeigniter 4 Google ReCaptcha V2 Example

Google recaptcha v2 integration in php codeigniter 4 app. In this tutorial, you will learn how to integrate google v2 recaptcha with forms in codeigniter 4 app.

This tutorial will show you how to stop spaming for making your forms or protect your forms for spamming in php codeigniter 4 app.

First of all, you need to create new Google reCaptcha key and secret for codeigniter 4 application. Follow all the below steps for creating google reCaptcha key or secret. Click here for creating a google reCaptcha key or secret. When you will click the given link, the below form open in your browser. Now fill this form and get your key and secret.

Google reCaptcha php Codeigniter

You will submit the above form after that you will be get google reCaptcha secret_site and secret_key.

google recaptcha

Now, copy this important key and secret.

Google V2 ReCaptcha Validation in PHP Codeigniter 4 app Example

  • Download Codeigniter 4 Project
  • Basic Configurations
  • Create Table in Database
  • Setup Database Credentials
  • Create Controller
  • Create View
  • Create Route
  • Start Development Server

Step 1: Download Codeigniter 4 Project

In this step, you will download the latest version of Codeigniter 4, Go to this link Download Codeigniter 4 fresh new setup and unzip the setup in your local system xampp/htdocs/ . And change the download folder name “demo”

Step 2: Basic Configurations

Next, you will set some basic configuration on the app/config/app.php file, so let’s go to application/config/config.php and open this file on text editor.

Set Base URL like this

public $baseURL = 'http://localhost:8080';
public $baseURL = 'http://localhost/demo/';

Step 3: Create Table in Database

In this step, you need to create table in database for codeiginter 4 app. So visit your phpmyadmin panel and execute the following sql query in it:

    id int(11) NOT NULL AUTO_INCREMENT COMMENT 'Primary Key',
    name varchar(100) NOT NULL COMMENT 'Name',
    email varchar(255) NOT NULL COMMENT 'Email Address',
    contact_no varchar(50) NOT NULL COMMENT 'Contact No',
    created_at varchar(20) NOT NULL COMMENT 'Created date',
    PRIMARY KEY (id)
  ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='datatable demo table' AUTO_INCREMENT=1;


Step 4: Setup Database Credentials

In this step, you need to connect our project to the database. you need to go app/Config/Database.php and open database.php file in text editor. After opening the file in a text editor, you need to set up database credentials in this file like below.

	public $default = [
		'DSN'      => '',
		'hostname' => 'localhost',
		'username' => 'root',
		'password' => '',
		'database' => 'demo',
		'DBDriver' => 'MySQLi',
		'DBPrefix' => '',
		'pConnect' => false,
		'DBDebug'  => (ENVIRONMENT !== 'production'),
		'cacheOn'  => false,
		'cacheDir' => '',
		'charset'  => 'utf8',
		'DBCollat' => 'utf8_general_ci',
		'swapPre'  => '',
		'encrypt'  => false,
		'compress' => false,
		'strictOn' => false,
		'failover' => [],
		'port'     => 3306,

Step 5: Create Controller

In this step, Visit app/Controllers and create a controller name GoogleReCaptcha.php. In this controller, you need to add the following methods into it:

<?php namespace App\Controllers;
use CodeIgniter\Controller;
use CodeIgniter\HTTP\RequestInterface;
use App\Models\UserModel;

class GoogleReCaptcha extends Controller

    public function index(){
      return view('home');

    public function googleCaptachStore() {

      $model = new UserModel();
      $data = array('name' => $this->request->getVar('name'),
                    'email' => $this->request->getVar('email'), 
                    'contact_no' => $this->request->getVar('mobile_number'), 
      $recaptchaResponse = trim($this->request->getVar('g-recaptcha-response'));
      $credential = array(
            'secret' => $secret,
            'response' => $this->request->getVar('g-recaptcha-response')

      $verify = curl_init();
      curl_setopt($verify, CURLOPT_URL, "");
      curl_setopt($verify, CURLOPT_POST, true);
      curl_setopt($verify, CURLOPT_POSTFIELDS, http_build_query($credential));
      curl_setopt($verify, CURLOPT_SSL_VERIFYPEER, false);
      curl_setopt($verify, CURLOPT_RETURNTRANSFER, true);
      $response = curl_exec($verify);

      $status= json_decode($response, true);
       $session->setFlashdata('msg', 'Form has been successfully submitted');
       $session->setFlashdata('msg', 'Something goes to wrong');
      return redirect()->to('/');


Step 6: Create View

In this step, you need to create one view files name home.php and update the following code into your file:

<!doctype html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Codeigniter Google Recaptcha Form Validation Example -</title>
<link rel="stylesheet" href="" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<script src=''></script>
.error{ color:red; } 
<div class="container">
<div class="error"><strong><?=$this->session->flashdata('msg')?></strong></div>
<div class="row">
<div class="col-md-9">
<form  method="post" action="<?php echo base_url('google/googleCaptachStore') ?>">
<div class="form-group">
<label for="formGroupExampleInput">Name</label>
<input type="text" name="name" class="form-control" id="formGroupExampleInput" placeholder="Please enter name">
<div class="form-group">
<label for="email">Email Id</label>
<input type="text" name="email" class="form-control" id="email" placeholder="Please enter email id">
<div class="form-group">
<label for="mobile_number">Mobile Number</label>
<input type="text" name="mobile_number" class="form-control" id="mobile_number" placeholder="Please enter mobile number" maxlength="10">
<div class="g-recaptcha" data-sitekey="YOUR_SITE_KEY"></div>  
<div class="form-group">
<button type="submit" id="send_form" class="btn btn-success">Submit</button>

Step 7: Create Route

In this step, you need to create a route that renders the table into the view, place the following code in app/Config/Routes.php file.

$routes->get('/', 'GoogleReCaptcha::index');

Step 8: Start Development Server

In this step, open your terminal and execute the following command to start development sever:

php spark serve

Then, Go to the browser and hit below the URL:



Codeigniter 4 integrate google reCaptcha example. Here you have learned how to integrate google reCaptcha with form in php codeigniter 4 app.

If you have any questions or thoughts to share, use the comment form below to reach us.

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My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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