php man page for filegroup

FILEGROUP(3)								 1							      FILEGROUP(3)

filegroup - Gets file group

SYNOPSIS
       int filegroup (string  $filename)

DESCRIPTION
	Gets the file group. The group ID is returned in numerical format, use posix_getgrgid(3) to resolve it to a group name.

PARAMETERS
	      o $filename
		- Path to the file.

RETURN VALUES
	Returns  the  group  ID  of  the file, or FALSE if an error occurs. The group ID is returned in numerical format, use posix_getgrgid(3) to
       resolve it to a group name. Upon failure, FALSE is returned.

EXAMPLES
       Example #1

	      Finding the group of a file

	      <?php
	      $filename = 'index.php';
	      print_r(posix_getgrgid(filegroup($filename)));
	      ?>

ERRORS
/EXCEPTIONS
	Upon failure, an E_WARNING is emitted.

NOTES
       Note

	      The results of this function are cached. See clearstatcache(3) for more details.

       Tip

	      As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to "Supported Protocols  and  Wrappers"  to  determine
	      which wrappers support stat(3) family of functionality.

SEE ALSO
       fileowner(3), posix_getgrgid(3), safe_mode_gid.

PHP Documentation Group 													      FILEGROUP(3)