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posix_initgroups

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

posix_initgroupsCalculate 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.

See Also

  • The Unix manual page for initgroups(3).

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victor dot kupiyanov at gmail dot com
10 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.
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