How to decode JSON using PHP5 for Facebook application

The new Graph API helps to read and write data to Facebook. Every object in the social graph has a unique ID. You can fetch the data associated with an object by fetching https://graph.facebook.com/ID. For example, the official page for the Facebook Platform has id 19292868552, so you can fetch the object at https://graph.facebook.com/19292868552 All responses are JSON objects. Here is the code to decode JSON OBJECT / to get data from the graph api link . 

Code Sample : //FETCHING THE JSON FROM THE URL

$jsonurl = "https://graph.facebook.com/". $user_id; $json = file_get_contents($jsonurl,0,null,null); $json_output = json_decode($json);

// THIS PRINTS THE WHOLE STRING OF JSON

var_dump( json_decode( $json,true)) ;

// ITS SAME AS YOU ARE USING it as an object

$user_firstName = $json_output->first_name;

//PRINTS THE FIRST NAME OF THE LOGGED IN USER

echo $user_firstName ;

You can also directly use the graph api for showing the profile picture. For example :

<img src="https://graph.facebook.com/<?= $user ?>/picture"/>

Link :

  Graph API Facebook Documentation