realpath_cache_get

array(2) {
  ["/test"]=>
  array(4) {
    ["key"]=>
    int(123456789)
    ["is_dir"]=>
    bool(true)
    ["realpath"]=>
    string(5) "/test"
    ["expires"]=>
    int(1260318939)
  }
  ["/test/test.php"]=>
  array(4) {
    ["key"]=>
    int(987654321)
    ["is_dir"]=>
    bool(false)
    ["realpath"]=>
    string(12) "/root/test.php"
    ["expires"]=>
    int(1260318939)
  }
}