getenvDescriptionRetrieves the name of an environment variable from the system. This may be path information, the location of the system temporary directory, etc. The availability of various environment variables differs from system to system. A mostly complete list can be displayed using phpinfo() . Other system information items such as PATH and PROMPT are global but not terribly useful. If PHP is an Apache module, those environment variables displayed in phpinfo are variables in the GLOBAL variable space within the script. getenv() can help improve security by ensuring that a script is accessing the value of an environment variable, instead of a value passed by a user or by a coding error.
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
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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
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