Page Comparison

<?php
// Login to the site and request the access token
$curl = curl_init('http://your-domain.com/restws/session/token');
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($curl, CURLOPT_USERPWD, "restws_webservice:webservice_password"); // Your web service user credentials go here.
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
$token = curl_exec($curl); 
// The token looks like "q71OBx05wtECfjA0KmXf6wiktewrywNhkMZv-OcfyOA%"

// Verify if the user is enrolled in the course
$curl = curl_init("http://your-domain.com/course_enrollment.json?uid=200&nid=300");
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($curl, CURLOPT_HTTPHEADER, array("X-CSRF-Token: $token", "Content-Type: application/json"));
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($curl, CURLOPT_USERPWD, "restws_webservice:webservice_password"); //Your credentials go here
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);

$json = curl_exec($curl);
$response = json_decode($json);
$list = $response->list; // See note below

if(empty($list)){
$data = array(
  'nid' => 300,
  'uid' => 200,
  'enrollmenttype' => 'webservice_call', // enrollmenttype and type should be updated per client system. They are the unique identifiers of the external system sending the call. 
  'type' => 'webservice_call', // Formatted in lower case alphanumeric and underscore characters. The two values are not required to be identical.
  'status' => 1,
);
// Send the enrollment creation request
$curl = curl_init("http://your-domain.com/course_enrollment");
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($curl, CURLOPT_HTTPHEADER, array("X-CSRF-Token: $token", "Content-Type: application/json"));
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($curl, CURLOPT_USERPWD, "restws_webservice:webservice_password"); //Your credentials go here
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));

$response = curl_exec($curl);
}