gistfile1.php

<?php
// turn what we figured out the user entered into a canonicalized string.
// $parsed is a hash with keys of scheme, user, domain, port, and path.
function normalize_input($parsed) {
  $identifier = '';
  if ($parsed['scheme'] == 'acct') {
    $identifier = 'acct:' . $parsed['user'] . '@' . $parsed['domain'];
  } else {
    $identifier = $parsed['scheme'] . '://' . $parsed['domain'];
    if ($parsed['port']) {
      $identifier .= ':' . $parsed['port'];
    }
  
     $identifier .= $parsed['path'] ? $parsed['path'] : '/';
  }

  return $identifier;
}