Quick redirect checker

quick_test_redirects.php

<?php

/**
 * This file provides a quick-n-dirty method for testing redirects.
 *
 * Just edit the $tests array and run from the CLI.
 *
 * If you are having problems, try making sure your DNS server is set to
 * something that isn't dnsmasq as I had problems with with it while
 * running this for a website in development.
 */

/**
 * This is an array of arrays, where each subarray has the following keys:
 * - test_uri: The URI to test.
 * - status: The expected status code.
 * - location: The expected redirect location for the request.
 */
$tests = array(
  // Redirect to the naked version of a URL.
  array('test_uri' => 'http://www.mywebsite.com/', 'status' => '301', 'location' => 'http://mywebsite.com/'),
  // Make sure this doesn't redirect.
  array('test_uri' => 'http://mywebsite.com/', 'status' => '200', 'location' => ''),
);

/**
 * Returns the status code and redirect location for a given URL.
 *
 * @param $url
 *    The URL to test.
 * @return array
 *    An array containing the following keys:
 *    - status: The HTTP status code.
 *    - location: The value of the Location header.
 */
function do_http_request($url) {
  $headers = @get_headers($url, 1);
  if (is_array($headers[0])) $headers[0] = $headers[0][0];
  if (is_array($headers['Location'])) $headers['Location'] = $headers['Location'][0];
  $statuscode = explode(' ', $headers[0])[1];
  return array('status' => $statuscode, 'location' => !empty($headers['Location']) ? $headers['Location'] : '');
}

/**
 * Runs the tests over the test array and outputs the results to stdout.
 *
 * @param $tests Array Aerray of test arrays. (See above.)
 */
function test_redirects($tests) {
  foreach ($tests as $test) {
    $status = 'FAIL';
    $info = do_http_request($test['test_uri']);
    if ($info['status'] == $test['status'] && $info['location'] == $test['location']) {
      $status = 'OK!';
    }
    printf("%4s (%-45s)      Got: %3d  %-45s
                                                     Expected: %3d  %-45s\n",
      $status, $test['test_uri'], $info['status'], $info['location'], $test['status'], $test['location']
    );
  }
}

// Do them!
test_redirects($tests);