(PHP 5 >= 5.1.2)
SplFileInfo::getPathInfo — Gets an SplFileInfo object for the path
Gets an SplFileInfo object for the parent of the current file.
Returns an SplFileInfo object for the parent path of the file.
Example #1 SplFileInfo::getPathInfo() example
<?php
$info = new SplFileInfo('/usr/bin/php');
$parent_info = $info->getPathInfo();
var_dump($parent_info->getRealPath());
?>
以上例程的输出类似于：
string(8) "/usr/bin"