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posix_seteuid

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

posix_seteuidSet the effective UID of the current process

说明

posix_seteuid ( int $uid ) : bool

Set the effective user 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.

参数

uid

The user id.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE

参见

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User Contributed Notes 1 note

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divinity76 at gmail dot com
4 months ago
if you want to set uid by username rather than uid, try combining it with posix_getpwnam(),

<?php
posix_seteuid
(posix_getpwnam("www-data")["uid"]);
posix_setegid(posix_getpwnam("www-data")["gid"]);
?>

note that posix_getpwnam() reads /etc/passwd on each invocation, if you need it to go fast, this should be faster (only read passwd once):
<?php
$posix_user_info
=posix_getpwnam("www-data");
posix_seteuid ($posix_user_info["uid"]);
posix_setegid($posix_user_info["gid"]);
?>

and to go back to being root, just set them to 0,

<?php
posix_seteuid
(0);
posix_setegid(0);
?>
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