getenv
string getenv(string name) Gets an environment variable value.
Returns:
Environment variable setting; FALSE on error
Description:
Retrieves 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 ...
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