gistfile1.php

<?php

  static protected function removeIncludePath($file)
  {
    $includePaths = explode(PATH_SEPARATOR, get_include_path());

    foreach ($includePaths as $includePath)
    {
      // ignore relative or invalid include paths
      if (0 === strpos($includePath, '.') || false === $includePath = realpath($includePath))
      {
        continue;
      }

      if (0 === strpos($file, $includePath.DIRECTORY_SEPARATOR))
      {
        return substr($file, strlen($includePath.DIRECTORY_SEPARATOR));
      }
    }

    return $file;
  }