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posix_seteuid — Attempts to set the effective user ID for the current process.


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


TRUE on success and FALSE on failure.


This function allows a process to attempt to change its effective user ID to that specified by uid . Unpriviledged users (for instance, the web server process on most systems) may only change the effective user ID to the real user ID and vice versa; other changes require super-user priviledges.


This is not actually a POSIX function and may not be supported on all systems. On unsupported systems, FALSE will always be returned. It should be supported on most BSD and SysV style systems, such as Linux and FreeBSD.


PHP 4.0.2


Example 1085. Setting the effective user ID for the current process

if (!posix_seteuid(503)) {
    echo "Could not set new user ID.\n";
} else {
    echo "User 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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