What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.



session_id — Gets or sets session ID.


string session_id([session]);
string session (optional): Session ID


Session ID; FALSE on error


Gets or sets the session ID. If you're not using your own session handlers, it's a good idea to let PHP take care of it for you. You can also retrieve the session ID using the SID constant. This can be used to append the session ID to URLs, although this can be automated by compiling PHP with transparent session support. Transparent session support has a performance hit, however, so should be used with care.


Existing since version 4.0


Example 1159. Show session ID

if (!$counter) {
echo session_id();

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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