apache_getenv — Retrieve Apache Subprocess Environment Variable
The article explains the PHP function apache_getenv, which retrieves the value of a specified Apache environment variable, describes its required Apache 2 context, details its parameters $variable and optional $walk_to_top, outlines the return value, and provides a usage example.
The apache_getenv function retrieves the value of a specified Apache environment variable.
This function is available only when PHP runs under Apache 2; otherwise it is undefined.
Parameters
variable – The name of the Apache environment variable to retrieve.
walk_to_top (optional, bool, default false) – Whether to fetch the top-level variable that is available to all Apache layers.
Return value
On success, the function returns the value of the requested Apache environment variable; on failure it returns FALSE.
Example
<?php
$ret = apache_getenv("SERVER_ADDR");
echo $ret; // 42.24.42.240
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