https://github.com/facebook/php-sdk
Extract it. We need only facebook.php and base_facebook.php files. Copy them to app directory. Delete all other files in .git folder. Now there should be only 4 files. Add new files to the git repository.
git add facebook.php
git add base_facebook.php
git add base_facebook.php
Now edit the index.php file to match our simple like gate requirements. First create a 'Facebook Object'.
require 'facebook.php';
$facebook = new Facebook(array(
'appId' => '405567522824849',
'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'cookie' => true
));
$facebook = new Facebook(array(
'appId' => '405567522824849',
'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'cookie' => true
));
Now 'Facebook Object' exists. Objects have methods. Use 'getSignedRequest' method. It contains a value called 'page-liked'. Use it to check whether visitor has already 'liked' the page.
$signed_request = $facebook->getSignedRequest();
if ( $signed_request['page']['liked'] )
if ( $signed_request['page']['liked'] )
Conditionally check the 'liked' state and take further actions.
if ( $signed_request['page']['liked'] ){
echo 'A fan.';
}
else
{
echo 'Not a fan yet.';
}
echo 'A fan.';
}
else
{
echo 'Not a fan yet.';
}
Now the 'index.php' file should look like this.
require 'facebook.php';
$facebook = new Facebook(array(
'appId' => '405567522824849',
'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
, 'cookie' => true
));
$signed_request = $facebook->getSignedRequest();
if ( $signed_request['page']['liked'] )
{
echo 'A fan.';
}
else
{
echo 'Not a fan yet.';
}
$facebook = new Facebook(array(
'appId' => '405567522824849',
'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
, 'cookie' => true
));
$signed_request = $facebook->getSignedRequest();
if ( $signed_request['page']['liked'] )
{
echo 'A fan.';
}
else
{
echo 'Not a fan yet.';
}
If one has not liked the page yet, it displays 'Not a fan'.
After the one liked the page. It displays 'A fan'.
Visit app integrated page tab below.
https://www.facebook.com/pages/PHP-Sri-Lanka/155553284581042?sk=app_405567522824849
Try It Yourself!
Have a look at the other parts of this tutorial.
Part 1: Simple Facebook Like Gate with Heroku Hosting
Part 2: Developing and Deploying with Heroku
Part 3: Implementing the Facebook Like Gate
