New env function

system/dotenv/autoloader.php

@@ -1,4 +1,28 @@
 <?php
+
 require_once 'Dotenv.php';
 require_once 'Loader.php';
 require_once 'Validator.php';
+
+
+if (!function_exists('env')) {
+    // Define function `env` if it doesn't already exists
+
+    /**
+     * Gets the environment varaible if set or returns the second argument
+     * 
+     * @param string    $varname
+     * The variable. null will return all environment varaibles
+     * 
+     * @param mixed     $default_value
+     * The value to return if $varname is not set
+     * 
+     * @return array|mixed
+     */
+    function env($varname = null, $default_value = "") {
+        if (is_null($varname)) {
+            return getenv();
+        }
+        return getenv($varname) ? getenv($varname) : $default_value;
+    }
+}