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posix_setuid
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posix_setuid

Name

posix_setuid — Sets the user ID for the current process (POSIX.1, 4.2.2)

Synopsis

bool posix_setuid(uid); int uid: Requested user ID

Returns

Description

This function attempts to set the user ID for the current process to that given in uid . Under Linux, a non-root process may elect to relinquish its priviledged user ID, perform some unpriviledged task, and securely resume its original user ID. Root processes must be more careful, as once they have given up their priviledged user ID it will be impossible to regain.

Version

PHP 3.0.13+, PHP 4.0b4+

Example

Example 1089. Setting the real user ID for the current process

if (!posix_setuid(503)) {
    echo "Could not set new group ID.\n";
} else {
    echo "Group ID successfully changed.\n";
}

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