(PHP 5 >= 5.2.0, PHP 7)
posix_initgroups — Calculate the group access list
posix_initgroups ( string $name , int $base_group_id ) : bool
Calculates the group access list for the user specified in name.
name
The user to calculate the list for.
base_group_id
Typically the group number from the password file.
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.posix-initgroups.php