posix_seteuid

(PHP 4 >= 4.0.2, PHP 5, PHP 7, PHP 8)

posix_seteuid — Set the effective UID of the current process

说明

posix_seteuid(int $user_id): 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

user_id: The user id.

返回值

成功时返回 true，或者在失败时返回 false。

参见

posix_geteuid() - Return the effective user ID of the current process
posix_setuid() - Set the UID of the current process
posix_getuid() - Return the real user ID of the current process

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User Contributed Notes 1 note

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divinity76 at gmail dot com ¶

4 years 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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