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posix_getsid — Returns the session ID of a process.


int posix_getsid(pid);
int pid: Process ID of the process to examine


The session ID of a process on success, or FALSE on failure.


This function returns the session ID of the whose process ID is given by pid . If pid is 0, then the current process's session ID will be returned.


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 3.0.10+, PHP 4.0b4+


Example 1079. Getting the session ID for the current process

if (FALSE === ($sessid = posix_getsid(0))) {
    echo "Could not get the session ID.\n";
} else {
    echo "Session ID: '$sessid'.\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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