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posix_getgrgid — Returns an array of information about the group identified by GID (POSIX.1, 9.2.1).


array posix_getgrgid(gid);
int gid: Group ID of group to examine


An array of group information, or FALSE on error.


This function returns information about the group having group ID gid from the system group database and returns it in an array. This array is a mixed array, with some string and some numeric indices. The numerically-indexed elements will be a list of members of the group, and the associative elements will be:

  • name: The name of the group.

  • gid: The numeric group ID.

  • members: The number of group members.


PHP 3.0.13+, PHP 4.0b4+


Example 1068. Getting information about a group by ID

if (!$grgid = posix_getgrgid(2)) {
    echo "Could not get group information.\n";
} else {

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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