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


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



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.


PHP 3.0.13+, PHP 4.0b4+


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";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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