Session management functions provide a way to carry data across normally sessionless HTTP requests. Prior to the release of PHP4, session functionality was emulated in software using PHPLib, and many people continue to use PHPLib for its many useful features in addition to session support. By default, sessions in PHP4 are file-based and session files are written in the /tmp directory. However, it's possible to write your own session handlers, so sessions can be stored in any store. Various session -handling directives are edited in the PHP ini file and at compile time, including transparent session support.
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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 http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ 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.