(PHP 5 >= 5.2.2)
SplFileInfo::getRealPath — Gets absolute path to file
This method expands all symbolic links, resolves relative references and returns the real path to the file.
This function has no parameters.
Returns the path to the file.
Example #1 SplFileInfo::getRealPath() example
<?php
$info = new SplFileInfo('/..//./../../'.__FILE__);
var_dump($info->getRealPath());
$info = new SplFileInfo('/tmp');
var_dump($info->getRealPath());
?>
上例的输出类似于：
string(28) "/private/tmp/phptempfile.php" string(12) "/private/tmp"