Check If The User Likes (Fan Of) Your Facebook Page When Landing On Your Page Tab


Check when user landed on facebook fan page tab, Wheather he is fan of this page or not ?



A lot of developers and admins Facebook pages don’t know that they can detect whether the visiting user is already a fan of the page or not.

When the user visit your Page Tab, Facebook will send you the usual signed_request but with additional parameter called page.

When a user navigates to the Facebook Page, they will see your Page Tab
 added in the next available tab position. Broadly, a Page Tab is 
loaded in exactly the same way as a Canvas Page. When a user selects 
your Page Tab, you will received the signed_request parameter with 
one additional parameter, page. This parameter contains a JSON object 
with an id (the page id of the current page), admin  (if the user is a 
admin of the page), and liked (if the user has liked the page). 
As with a Canvas Page, you will not receive all the user information 
accessible to your app in the signed_request until the user authorizes 
your app.




<?php

$signed_request = $_REQUEST["signed_request"];

list($encoded_sig, $payload) = explode('.', $signed_request, 2);

$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);

if (empty($data["page"]["liked"])) {

    echo "You are not a fan!";

} else {

    echo "Welcome back fan!";

}

?>

Comments

Post a Comment

Popular posts from this blog

How to check browser cookie enabled with php and javascript

Cookies are typically used by web servers to perform functions such as tracking your visits to websites, enabling you to log in to sites, and storing your shopping cart. Cookies can be used to interaction between Javascript and Server Side Scripts like PHP.Cookies also used to transfer small amount of data between one page to other pages via HTTP headers .If user disables this cookies or user’s browser won’t support the interaction between JS and PHP fails.So we must ensure user must enable these Cookies. Checking with Javascript if (navigator.cookieEnabled == 0) { alert("You need to enable cookies for this site to load properly!"); } Checking with PHP If user disables Javascript we fail to check the Cookie enabled or not.So we check on the server side also.below PHP snippet check the Cookie enabled or not. function check_cookie(){ if (setcookie("test", "test", time() + 360)) { if (isset ($_COOKIE['test'])) { return true; } } return false; }
Read more

Output buffering in php

Output buffering is used by PHP to improve performance and to perform a few tricks. Without output buffering (the default), your HTML is sent to the browser in pieces as PHP processes through your script. With output buffering, your HTML is stored in a variable and sent to the browser as one piece at the end of your script. Advantages of output buffering: Turning on output buffering alone decreases the amount of time it takes to download and render our HTML because it’s not being sent to the browser in pieces as PHP processes the HTML. All the fancy stuff we can do with PHP strings, we can now do with our whole HTML page as one variable. If you’ve ever encountered the message “Warning: Cannot modify header information – headers already sent by (output)” while setting cookies, you’ll be happy to know that output buffering is your answer. Use Facebook to Comment on this Post Output buffering in php
Read more

PHP Best Practise

Always use PHP standard tags i.e.  <?php ?> .  To ensure the future version support, Please use standard tags for PHP. Always follow a consistent naming standards. Always use Indent and white spaces in codes. It helps to read and understand the code. Always turn on the full error reporting for development. It will show you complete list of notices, warnings and errors. When you are sending you code to production, Please make sure that you have turn off the error reporting else problems would be visible to users.  You can turn on the error reporting by php.ini. error reporting can be enabled on runtime by error_reporting() function. Always do the client and server side validation wherever there is scope of user input. You can not trust on your users. Always put comment in your code. It will make it easy to understand to others. You should use caching mechanism for the performance of the site. Ex.- memcache Don’t do the deep nesting. It will make the code complicated. Always avoid ...
Read more