Login with Google Account in PHP


In this tutorial, we use the Google OAuth API which is an easy and powerful way to add Google login to website.The following example shows, how to add Google Login in website using Google OAuth API with PHP.

Steps to Integrate Login with Google Account using PHP

  • Create Google API project
  • Download Google PHP API Client Library
  • Create Google Config PHP file
  • Create a Login Page,Home Page and Logout Page

Steps to Create Google API credentials

1. Go to https://console.developers.google.com. This link will open up Google Cloud Platform Dashboard

2. Click on the Select a project Dropdown. It will open up a popup as shown on image below

Create new project

Click on the New Project link and it will ask you to enter the Project Name as shown on image below

New project Details

Click on the Create button to save new project. It will be redirected to the Dashboard and Select Your new project from dropdown as shown on image below

Select Current Project

3. Click on the OAuth consent screen in the left sidebar. On this page you will select User Type as External and click on Create Button as shown on image below

Go to OAuth Consent Screen

After click on create button it will redirected to app registration page. You have to enter a project name, select user support email and enter your email id on the Developer Contact Information. And Click on SAVE AND CONTINUE button as shown on image below

App User Access Type App Details

5. Click on Credentials in the left sidebar and Click on CREATE CREDENTIALS. It will open up a popup, you will select OAuth client ID as shown on image below.

Go to Credentials

6.After click on OAuth client ID, it will redirected to Create OAuth Client ID Page. You have to select web application in Application Type Dropdown. Next, Enter the details Name, URIs as shown on image below and Save it.

Go to OAuth client ID URI Details Redirect URI Details

7.After click on SAVE button, it will redirected to Credentials Page. And, It will open up a popup with Client Id and Client Secret as shown on image below

Client Id and Client Secret

Google API Client Library for PHP

You could download Google API php Client Library from the googleapis github. After download it, Extract the zip file and rename to google-api-php-client in sample folder.

Google API Client Library Integration With PHP

In this example we used four php files.

Files and Directory

sample/
  ├── google-api-php-client/
  ├── gc_config.php
  ├── login.php
  ├── home.php
  └── logout.php
gc_config.php 
<?php 
  require "google-api-php-client/vendor/autoload.php";
  
  $clientId="<CLIENT_ID>";
  $clientSecret="<CLIENT_SECRET>";
  $redirectURI="<REDIRECT_URI>";
  
  $client=new Google_Client();
  $client->setClientId($clientId);
  $client->setClientSecret($clientSecret);
  $client->setRedirectURI($redirectURI);
  $client->addScope("email");
  $client->addScope("profile");
?>
login.php 
<?php 
  session_start();
  
  include "gc_config.php";
  
  if(isset($_GET["code"])){
    $token=$client->fetchAccessTokenWithAuthCode($_GET["code"]);
    $client->setAccessToken($token["access_token"]);
    
    $obj=new Google_Service_Oauth2($client);
    $data=$obj->userinfo->get();
    
    if(!empty($data->email)&&!empty($data->name)){
      
      //if you want to register user details, place mysql insert query here
      
      $_SESSION["email"]=$data->email;
      $_SESSION["name"]=$data->name;
      header("location:home.php");
    }
  }
?>
<html>
  <head>  
    <title>Login With Google Account in PHP</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
  <head>
  <body>
    <div class='container mt-5 text-center'>
      <h2>Login With Google Account in PHP</h2><br>
      <a href='<?php echo  $client->createAuthUrl(); ?>' class='btn btn-danger'>Login With Google</a>
    </div>
  </body>
</html>
home.php 
<?php 
  session_start();
  if(!isset($_SESSION["email"])){
    header("location:login_page.php");
  }
?>
<html>
  <head>
    <title>Home</title>
  </head>
  <body>
    <h1>Login Successfully. Welcome <?php echo $_SESSION["name"]; ?></h1>
    <a href='logout.php'>Logout</a>
  </body>
</html>
logout.php 
<?php 
  session_start();
  unset($_SESSION["name"]);
  unset($_SESSION["email"]);
  session_destroy();
  header("location:login_page.php");
?>
Output Login with Google Account in PHP