How to Extract a JSON Object and Its Access Token from a URL Using PHP?

How to Retrieve a JSON Object and Its Access Token from a URL Using PHP

Problem:
Given a URL endpoint that returns a JSON object like the one below, you want to use PHP to extract the JSON object and retrieve the "access_token" value:

{
    "expires_in":5180976,
    "access_token":"AQXzQgKTpTSjs-qiBh30aMgm3_Kb53oIf-VA733BpAogVE5jpz3jujU65WJ1XXSvVm1xr2LslGLLCWTNV5Kd_8J1YUx26axkt1E-vsOdvUAgMFH1VJwtclAXdaxRxk5UtmCWeISB6rx6NtvDt7yohnaarpBJjHWMsWYtpNn6nD87n0syud0"
}

Solution:

Using file_get_contents()

The file_get_contents() function allows you to obtain the contents of a URL. To retrieve the JSON object and extract the "access_token" value:

$json = file_get_contents('url_here');
$obj = json_decode($json);
echo $obj->access_token;

Note that allow_url_fopen must be enabled in your PHP configuration for file_get_contents() to work.

Using cURL

cURL is an alternative method for retrieving the URL contents. Here's an example:

$ch = curl_init();
// For security reasons, this is a risk and should be set to true
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL, 'url_here');
$result = curl_exec($ch);
curl_close($ch);

$obj = json_decode($result);
echo $obj->access_token;

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