diff --git a/functions/functions.php b/functions/functions.php
index 505d5ff..472b5c5 100644
--- a/functions/functions.php
+++ b/functions/functions.php
@@ -4,7 +4,7 @@
 
 interface ArrisFunctionsInterface {
 
-    function setOption(array $options, string $key, $env_key = null, $default_value = '');
+    function setOption(array $options, $key, $env_key = null, $default_value = '');
     function checkAllowedValue( $value, $allowed_values_array , $invalid_value = NULL );
 
     function mb_trim_text($input, $length, $ellipses = true, $strip_html = true, $ellipses_text = '...'):string;
@@ -47,7 +47,11 @@ function checkAllowedValue( $value, $allowed_values_array , $invalid_value = NUL
      *
      * use function ArrisFunctions\setOption as setOption;
      *
-     * $nginx_cache_levels = setOption($options, 'cache_levels', 'NGINX::NGINX_CACHE_LEVELS', '1:2');
+     * ($options, $key, $env_key, $default) =>  $options[ $key ]
+     * ([], $key, $env_key, $default)       =>  get_env( $env_key )
+     * ($arr, null, $env_key, $default)     =>  get_env( $env_key )
+     * ([], null, null, $default)           =>  default
+     * ([], null, null, null)               =>  null
      *
      * @param array $options
      * @param string $key
@@ -55,13 +59,23 @@ function checkAllowedValue( $value, $allowed_values_array , $invalid_value = NUL
      * @param string $default_value
      * @return string
      */
-    function setOption(array $options, string $key, $env_key = null, $default_value = '')
+    function setOption(array $options, $key, $env_key = null, $default_value = '')
     {
-        // return (array_key_exists($key, $options) ? $options[$key] : null) ?: getenv($env_key) ?: $default_value;
+        if (empty($options) || is_null($key)) {
 
-        return (array_key_exists($key, $options) ? $options[$key] : null)
-            ?: (!is_null($env_key) ? getenv($env_key) : null )
-                ?: $default_value;
+            if (is_null($env_key)) {
+                return $default_value;
+            }
+
+            return getenv($env_key);
+
+        } elseif (array_key_exists($key, $options)) {
+            return $options[$key];
+        } elseif (!is_null($env_key)) {
+            return getenv($env_key);
+        } else {
+            return $default_value;
+        }
     }
 }
 
diff --git a/sources/Toolkit/NginxToolkit.php b/sources/Toolkit/NginxToolkit.php
index 98b0197..a993cdd 100644
--- a/sources/Toolkit/NginxToolkit.php
+++ b/sources/Toolkit/NginxToolkit.php
@@ -90,18 +90,18 @@ public static function init($options = [], $logger = null)
 
         self::$is_logging = setOption($options, 'isLogging', 'NGINX.LOG_CACHE_CLEANING', false);
 
-        self::$is_using_cache = setOption($options, 'isUseCache', 'NGINX.NGINX_CACHE_USE', false);
+        self::$is_using_cache = setOption($options, 'isUseCache', 'NGINX.CACHE_USE', false);
 
-        self::$nginx_cache_root = setOption($options, 'cache_root', 'NGINX.NGINX_CACHE_PATH');
+        self::$nginx_cache_root = setOption($options, 'cache_root', 'NGINX.CACHE_PATH');
         self::$nginx_cache_root = rtrim(self::$nginx_cache_root, DIRECTORY_SEPARATOR);
         if (empty(self::$nginx_cache_root)) {
-            throw new \Exception(__METHOD__ . ' throws error, NGINX.NGINX_CACHE_PATH is empty');
+            throw new \Exception(__METHOD__ . ' throws error, NGINX.CACHE_PATH is empty');
         }
 
-        self::$nginx_cache_levels = setOption($options, 'cache_levels', 'NGINX.NGINX_CACHE_LEVELS', '1:2');
+        self::$nginx_cache_levels = setOption($options, 'cache_levels', 'NGINX.CACHE_LEVELS', '1:2');
         self::$nginx_cache_levels = explode(':', self::$nginx_cache_levels);
 
-        self::$nginx_cache_key = setOption($options, 'cache_key_format', 'NGINX.NGINX_CACHE_KEY_FORMAT', 'GET|||HOST|PATH');
+        self::$nginx_cache_key = setOption($options, 'cache_key_format', 'NGINX.CACHE_KEY_FORMAT', 'GET|||HOST|PATH');
     }
 
     public static function clear_nginx_cache(string $url)
diff --git a/tests/test_setoption.php b/tests/test_setoption.php
new file mode 100644
index 0000000..22bdb9a
--- /dev/null
+++ b/tests/test_setoption.php
@@ -0,0 +1,53 @@
+<?php
+
+require_once __DIR__ . DIRECTORY_SEPARATOR . '../vendor/autoload.php';
+
+use function Arris\setOption;
+use function Arris\setOption as test;
+
+$options = [
+    'key1'  =>  'key1 is 1',
+    'key2'  =>  'key2 is 4'
+];
+
+putenv("FOO=BAR");
+
+// 'key1 is 1'
+echo __LINE__, ' : '; var_dump( test($options, 'key1', 'FOO', __LINE__) );
+
+// BAR
+echo __LINE__, ' : '; var_dump( test($options, 'key3', 'FOO', __LINE__) );
+
+// 22
+echo __LINE__, ' : '; var_dump( test($options, 'key3', null, __LINE__) );
+
+// false (because getenv return false)
+echo __LINE__, ' : '; var_dump( test($options, 'key3', 'XXX', __LINE__) );
+
+// BAR
+echo __LINE__, ' : '; var_dump( test([], 'key3', 'FOO', __LINE__) );
+
+// false
+echo __LINE__, ' : '; var_dump( test([], 'key3', 'XXX', __LINE__) );
+
+// 34
+echo __LINE__, ' : '; var_dump( test([], 'key3', null, __LINE__) );
+
+// BAR
+echo __LINE__, ' : '; var_dump( test($options, null, 'FOO', __LINE__) );
+
+// false
+echo __LINE__, ' : '; var_dump( test($options, null, 'XXX', __LINE__) );
+
+// 43
+echo __LINE__, ' : '; var_dump( test($options, null, null, __LINE__) );
+
+// BAR
+echo __LINE__, ' : '; var_dump( test([], null, 'FOO', __LINE__) );
+
+// false
+echo __LINE__, ' : '; var_dump( test([], null, 'XXX', __LINE__) );
+
+// 52
+echo __LINE__, ' : '; var_dump( test([], null, null, __LINE__) );
+