[PHP] Find the Destination of a Redirect with PHP

00-get-destination-url.php

<?php
/**
 * Determines the destination URL of a provided URL that gives a redirect.
 *
 * @param string $url the specified URL provided by the API.
 * @return string $url the destination of the specified URL.
 */
private function getDestinationUrl($url)
{
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_HEADER, true);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

  // Read the headers as provided by cURL.
  $headers = curl_exec($ch);
  $url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);

  // We only need the domain so just read the first part.
  $url = explode('/', $url);
  $url = $url[0];

  return $url;
}