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Login Google using PHP

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27 Sep 2019CPOL
Introduction 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.

https://hoanguyenit.com/public/upload/images/google-console-api-key-01.png

Image 2

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.

Image 3

Success!

History

  • 27th September, 2019: Initial version

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

AzdevXXI
Web Developer Sinbadgroup
Vietnam Vietnam
No Biography provided

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QuestionCode not working when returning back to site Pin
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Posted 27 Sep 2019

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