(PHP 4, PHP 5, PHP 7)
putenv — Sets the value of an environment variable
putenv ( string $setting ) : bool
Adds setting
to the server environment. The environment variable will only exist for the duration of the current request. At the end of the request the environment is restored to its original state.
setting
The setting, like "FOO=BAR"
Returns true
on success or false
on failure.
Example #1 Setting an environment variable
<?php putenv("UNIQID=$uniqid"); ?>
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https://www.php.net/manual/en/function.putenv.php