How to login with facebook in php?

 

Step1:

Please insert the Following script inside body tag of your login/register page. 

 

 

<div id="fb-root" style="float:left; width:1px;"></div> <script> window.fbAsyncInit = function() { FB.init({ appId: 'Enter your API here', cookie: true, xfbml: true, oauth: true }); }; (function() { var e = document.createElement('script'); e.async = true; e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js'; document.getElementById('fb-root').appendChild(e); }()); function fblogin(){ FB.login(function(response){ if (response.authResponse) { window.location='validatefb.php'; } },{scope: 'publish_stream'}); } </script>  

Click here to know more about Permissions in Facebook.Click here to generate App ID/API Key and App Secret for Facebook. Step2: Please insert login with face book button and write down the following code.

<img border="0" src="images/login_facebook.png" onClick="fblogin();" border="0" style="cursor:pointer">

 

 

 

The above code will open a popup to login with Facebook.  

Download PHP sdk for facebook, put into your site directory and include php file and do with callback url for login etc likerequire_once("facebook.php");

$params = array('scope'=>'read_stream, 'friends_likes','redirect_uri'=>'https://www.myapp.com/post_login_page');$loginUrl= $facebook->getLoginUrl($params);Or you can do via Javascript code into your html page, like example https://developers.facebook.com/docs/reference/javascript

PHP script that generates the login link is called /login.php. The callback URL that Facebook redirects the user to after login dialog is called /fb-callback.php.