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                                    putenv

   (PHP 3, PHP 4 )
   putenv -- Sets the value of an environment variable

Description

   void putenv ( string setting)

   Adds setting to the server environment. The environment variable will
   only exist for the duration of the current request. At the end of the
   request the environment is restored to its original state.

   Setting certain environment variables may be a potential security
   breach. The safe_mode_allowed_env_vars directive contains a
   comma-delimited list of prefixes. In Safe Mode, the user may only
   alter environment variables whose names begin with the prefixes
   supplied by this directive. By default, users will only be able to set
   environment variables that begin with PHP_ (e.g. PHP_FOO=BAR). Note:
   if this directive is empty, PHP will let the user modify ANY
   environment variable!

   The safe_mode_protected_env_vars directive contains a comma-delimited
   list of environment variables, that the end user won't be able to
   change using putenv(). These variables will be protected even if
   safe_mode_allowed_env_vars is set to allow to change them.

   Warning

   These directives have only effect when safe-mode itself is enabled!

   Example 1. Setting an environment variable
   <?php
   putenv("UNIQID=$uniqid");
   ?>

   See also getenv().
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