posix_setgid

    (PHP 4, PHP 5, PHP 7, PHP 8)

    posix_setgid — Set the GID of the current process

    Опис

    posix_setgid(int $group_id): bool

    Set the real group ID of the current process. This is a privileged function and needs appropriate privileges (usually root) on the system to be able to perform this function. The appropriate order of function calls is posix_setgid() first, posix_setuid() last.

    Зауваження:

    If the caller is a super user, this will also set the effective group id.

    Параметри

    group_id

    The group id.

    Значення, що повертаються

    Повертає true у разі успіху або false в разі помилки.

    Приклади

    Приклад #1 posix_setgid() example

    This example will print out the effective group id, once it is changed.

    <?php
    echo 'My real group id is '.posix_getgid(); //20
    posix_setgid(40);
    echo     'My real group id is '.posix_getgid(); //40
    echo 'My effective group id is '.posix_getegid(); //40
    ?>

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    User Contributed Notes 1 note

    up
    1
    jac
    13 years ago
    if you're going to use this along with posix_setuid, make sure you call posix_setgid first:

    <?php
    define     (PROC_USER, 'john');
    define (PROC_GRP, 'admins');
    ?>

    following works:

    <?php
    $user     = posix_getpwnam( PROC_USER );
    $group = posix_getgrnam( PROC_GRP);

    echo     posix_getuid()."\n";
    echo     posix_getgid()."\n";

    posix_setgid($group['gid']);
    posix_setuid($user['uid']);

    echo     posix_getuid()."\n";
    echo     posix_getgid()."\n";
    ?>

    following will not set gid

    <?php
    $user     = posix_getpwnam( PROC_USER );
    $group = posix_getgrnam( PROC_GRP);

    echo     posix_getuid()."\n";
    echo     posix_getgid()."\n";

    posix_setuid($user['uid']);
    posix_setgid($group['gid']);

    echo     posix_getuid()."\n";
    echo     posix_getgid()."\n";
    ?>
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