Login Google using PHP

Here, I'm going to share a very simple example for Login Google using PHP. First of all, we need set up Google API Console.

After setting up Google API Console, we have Client ID and Client secret. Okay, next step, we need library installing from Google to project.

$ composer require google/apiclient:"^2.0"

or your download: https://github.com/googleapis/google-api-php-client/releases

Ok, we have to project directory create define.php file, you can copy the following code given below, paste to file define.php.

<?php
    //set define login google
    define('GOOGLE_APP_ID','CLIENG_ID');
    define('GOOGLE_APP_SECRET','CLIENT_SECRET');
    define('GOOGLE_APP_CALLBACK_URL','http://localhost/LoginGoogle/redirect-google.php');
    define('LOCALHOST','localhost');
    define('USERNAME','root');
    define('PASSWORD','');
    define('DATABASE','ABC');
?>

Next step, we need to project directory create redirect-google.php file, you can copy the following below code, pass to it:

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

    /**
     * SET CONNECT 
     */
    $conn = mysqli_connect(LOCALHOST,USERNAME,PASSWORD,DATABASE);
    if (!$conn) {
        echo "Error: Unable to connect to MySQL." . PHP_EOL;
        echo "Debugging errno: " . mysqli_connect_errno() . PHP_EOL;
        echo "Debugging error: " . mysqli_connect_error() . PHP_EOL;
        exit;
    }
    

    /**
     * CALL GOOGLE API
     */
    require_once 'google-api-php-client-2.4.0/vendor/autoload.php';
    $client = new Google_Client();
    $client->setClientId(GOOGLE_APP_ID);
    $client->setClientSecret(GOOGLE_APP_SECRET);
    $client->setRedirectUri(GOOGLE_APP_CALLBACK_URL);
    $client->addScope("email");
    $client->addScope("profile");
   
    if (isset($_GET['code'])) {
        $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
       // print_r($token);
        $client->setAccessToken($token['access_token']);

        // get profile info
        $google_oauth = new Google_Service_Oauth2($client);
        $google_account_info = $google_oauth->userinfo->get();
        $email =  $google_account_info->email;
        $name =  $google_account_info->name;
       // print_r($google_account_info);
       /**
        * CHECK EMAIL AND NAME IN DATABASE
        */
        $check = "SELECT * FROM `users` WHERE `email`='".$email."' and `name`='".$name."'";
        $result = mysqli_query($conn,$sql);
        $rowcount=mysqli_num_rows($result);
        if($rowcount>0){
            /**
             * USER EXITS
             */
            header('location:home');
        }
        else{
            /**
             * INSERT USER TO DATABASE
             * AFTER INSERT, YOU CAN HEADER TO HOME
             */
        }
       
    } else {
        /**
         * IF YOU DON'T LOGIN GOOGLE
         * YOU CAN SEEN AGAIN GOOGLE_APP_ID, GOOGLE_APP_SECRET, GOOGLE_APP_CALLBACK_URL
         */
        echo "<a href='".$client->createAuthUrl()."'>Google Login</a>";
    }

Okay, we have configution success, you can run test: http://localhost/LoginGoogle/redirect-google.php. you will see it.

Success!

History

• 27^th September, 2019: Initial version