php man page for posix_getegid

POSIX_GETEGID(3)							 1							  POSIX_GETEGID(3)

posix_getegid - Return the effective group ID of the current process

SYNOPSIS
       int posix_getegid (void	)

DESCRIPTION
	Return the numeric effective group ID of the current process.

RETURN VALUES
	Returns an integer of the effective group ID.

EXAMPLES
       Example #1

	      posix_getegid(3) example

	       This example will print out the effective group id, once it is changed with posix_setegid(3).

	      <?php
	      echo 'My real group id is '.posix_getgid(); //20
	      posix_setegid(40);
	      echo 'My real group id is '.posix_getgid(); //20
	      echo 'My effective group id is '.posix_getegid(); //40
	      ?>

NOTES
       posix_getegid(3) is different than posix_getgid(3) because effective group ID can be changed by a calling process using posix_setegid(3).

SEE ALSO
       posix_getgrgid(3), posix_getgid(3), posix_setgid(3).

PHP Documentation Group 													  POSIX_GETEGID(3)