posix_initgroups

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

posix_initgroups — Calculate the group access list

Description

posix_initgroups(string $username, int $group_id): bool

Calculates the group access list for the user specified in name.

Parameters

username: The user to calculate the list for.
group_id: Typically the group number from the password file.

Return Values

Returns true on success or false on failure.

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User Contributed Notes 1 note

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victor dot kupiyanov at gmail dot com ¶

13 years ago

The function does not calculate groups, it sets groups access list of the current process in accordance to user information in /etc/groups.
Quote from Unix manual page for initgroups:
NAME
 initgroups - initialize the supplementary group access list
...
DESCRIPTION
 The initgroups() function initializes the group access list by reading the 
 group database /etc/group and using all groups of which user is a member. 
 The additional group group is also added to the list.