Enhanced ENV function mixing both Laravel & CakePHP's env()

env_helper.php

<?php

if (!function_exists('eenv')) {
    /**
     * Enhanced ENV()
     *
     * Gets the value of an environment variable.
     *
     * @param  string  $key
     * @param  mixed   $default
     * @return mixed
     */
    function eenv($key, $default = null)
    {
        $value = null;
        if (isset($_SERVER[$key])) {
            $value = $_SERVER[$key];
        } elseif (isset($_ENV[$key])) {
            $value = $_ENV[$key];
        } elseif (getenv($key) !== false) {
            $value = getenv($key);
        }

        if ($value === false) {
            return value($default);
        }

        switch (strtolower($value)) {
            case 'true':
            case '(true)':
                return true;
            case 'false':
            case '(false)':
                return false;
            case 'empty':
            case '(empty)':
                return '';
            case 'null':
            case '(null)':
                return;
        }

        if (($valueLength = strlen($value)) > 1 && $value[0] === '"' && $value[$valueLength - 1] === '"') {
            return substr($value, 1, -1);
        }

        return $value;
    }
}