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posix_getgroups — Returns supplementary group IDs (POSIX.1, 4.2.3)


array posix_getgroups(void)


An indexed array of supplementary group IDs, or FALSE on error.


This function returns a list of the supplementary group IDs for the current process in an indexed array.


PHP 3.0.10+, PHP 4.0b4+


Example 1070. Getting a list of supplementary group IDs

if (!$groups = posix_getgroups()) {
    echo "Could not get group listing.\n";
} else {
    echo "This process belongs to the following groups:\n";

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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