Get only specific code - php

Question

In my site user get their own secret code with access token and submit That code in my site and from this all code I only want to take access token with the help of php...
Check this ScreenShootss.jpg
Example of access token {"session_key":"5.TVJlCXvhgqdhpA.1497109242.26-100007001746590","uid":100007001746590,"secret":"80cc3dc2ba89e635dcf84b41d6efcc38","access_token":"EAAAAAYsX7TsBAEa6qMaCj1qCgnOKFHBcfu76C6PrUdK1LnIh39jmabZAdVWmQLO3Ol64ZCXY4388DBfUwksxONGXE5dUY0mK9M07aszl5Qvs8ccqQ39xLEsK2gc1RUJQ0Kqy1ror7R8EPHZCX6pOzX0o4oQAJ1kOq8Oz0n0GysK64ebCsDEokwG36j1awnYaDoJPvOn2AZDZD","machine_id":"-hI8WaLcNeEVUSPuxcEpmhQU","confirmed":true}
And I also try to separate access token by separating all this code but this actually not working
Here is my php script
if(isset($_POST['submit'])) {
$token2 = $_POST['token'];
if(preg_match("'access_token=(.*?)&expires_in='", $token2, $matches)){
$token = $matches[1];
}
else{
$token = $token2;
}
$extend = get_html("https://graph.facebook.com/me/permissions?access_token=" . $token);
How to do this and thanks in advance

Answer 1

please try to parse this json into an array using php, then you can collect the token attribute that you need and continue with your validation flow. There is a related link with this solution: How to convert JSON string to array
There is a basic example:
$your_submit_data = '{"session_key":"5.TVJlCXvhgqdhpA.1497109242.26-100007001746590","uid":100007001746590,"secret":"80cc3dc2ba89e635dcf84b41d6efcc38","access_token":"EAAAAAYsX7TsBAEa6qMaCj1qCgnOKFHBcfu76C6PrUdK1LnIh39jmabZAdVWmQLO3Ol64ZCXY4388DBfUwksxONGXE5dUY0mK9M07aszl5Qvs8ccqQ39xLEsK2gc1RUJQ0Kqy1ror7R8EPHZCX6pOzX0o4oQAJ1kOq8Oz0n0GysK64ebCsDEokwG36j1awnYaDoJPvOn2AZDZD","machine_id":"-hI8WaLcNeEVUSPuxcEpmhQU","confirmed":true}';
$your_array = json_decode($your_submit_data, TRUE);
echo($your_array['access_token']);
Best,

Answer 2

You can use this code to get only access_token from JSON code
if(isset($_POST['submit'])) {
$token2 = $_POST['token'];
$obj = json_decode($token2);
echo "Access Token is: <br />". $obj->{'access_token'}; // You can remove it or use this value
$token = $obj->{'access_token'};
$extend = get_html("https://graph.facebook.com/me/permissions?access_token=" . $token);
}