(PHP 5 >= 5.1.2)
SplFileInfo::getGroup — Gets the file group
Gets the file group. The group ID is returned in numerical format.
This function has no parameters.
The group id in numerical format.
Throws RuntimeException on error.
Example #1 SplFileInfo::getFilename() example
<?php
$info = new SplFileInfo(__FILE__);
print_r(posix_getgrgid($info->getGroup()));
上例的输出类似于：