filegroup: Gets file group

<?php
   $gid = filegroup("/etc/passwd");
   // Returns "0" on Unix, because root usually has GID of 0.

   echo $gid;
?>

1.	Is it a file: is_file()
2.	Is the file a directory: is_dir()
3.	Is the file readable: is_readable()
4.	Is the file writable: is_writable()
5.	File changed time
6.	File modified time
7.	File accessed time
8.	Checking the Mode of a File
9.	Determining the Size of a File
10.	Get the file size: filesize
11.	Is the file executable: is_executable
12.	File last changed time
13.	File last accessed time
14.	Get the file owner
15.	Get file permission
16.	File last updated time

filegroup: Gets file group : File Property « File Directory « PHP