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(PHP 4 >= 4.0.2, PHP 5, PHP 7, PHP 8)
posix_setegid — Set the effective GID of the current process
$group_id): bool
Set the effective 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.
group_id
The group id.
成功时返回 true， 或者在失败时返回 false。
示例 #1 posix_setegid() example
This example will print out the effective group id, once changed.
<?php
echo 'My real group id is '.posix_getgid(); //20
posix_setegid(40);
echo 'My real group id is '.posix_getgid(); //20
echo 'My effective group id is '.posix_getegid(); //40
?>
