Systemparser fix to static setter and getter

Author: marinsagovac

src/Envparser.php

@@ -150,7 +150,8 @@ public function checkSystemVar($variable)
 
     public function getSystemVars($variable = null)
     {
-        return $this->systemparser->getValues($variable);
+        $systemparse = $this->systemparser;
+        return $systemparse::getValues($variable);
     }
 
     public function run()

src/Parser/SystemParser.php

@@ -17,16 +17,16 @@ public function __construct()
 
     public function parse()
     {
-        if (function_exists('getenv')) {
-            return getenv();
+        if (!empty($_ENV)) {
+            return $_ENV;
         }
 
-        if (is_array($_ENV)) {
-            return $_ENV;
+        if (function_exists('getenv')) {
+            return getenv();
         }
     }
 
-    public function getValues($variable = null)
+    public static function getValues($variable = null)
     {
         if (!is_null($variable)) {
             if (isset(self::$sysvar[$variable])) {
@@ -36,15 +36,20 @@ public function getValues($variable = null)
             }
         }
 
-        return self::$sysvar;
+        return static::getAllEnvVariables();
     }
 
-    public function checkValue($variable)
+    public static function checkValue($variable)
     {
         if (isset(self::$sysvar[$variable])) {
             return true;
         }
 
         return false;
     }
+
+    private static function getAllEnvVariables()
+    {
+        return static::$sysvar;
+    }
 }