<?php
$headers = array("Authorization: Bearer <ACCESS_TOKEN>",
"Content-Type: application/json");
$ch = curl_init('https://api.dropboxapi.com/2/users/get_space_usage');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, "null");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);
echo $response;
?>
<ACCESS_TOKEN>
should be replaced with the OAuth 2 access token.