Fetch environment even if the $_ENV superglobal is unset due to the `variables_order` INI setting.

getEnvironment.php

<?php

function getEnvironment() {
    if ($_ENV) {
        return $_ENV;
    }

    $keys = array_keys($_SERVER);

    return $_ENV = array_filter(
        array_combine(
            $keys,
            array_map('getenv', $keys)
        ),
        'is_string'
    );
}