add a simple process util

Author: inhere

src/Utils/Helper.php

@@ -25,6 +25,14 @@ public static function isOnWindows(): bool
         return DIRECTORY_SEPARATOR === '\\';
     }
 
+    /**
+     * @return bool
+     */
+    public static function isMac(): bool
+    {
+        return stripos(PHP_OS, 'Darwin') !== false;
+    }
+
     /**
      * @return bool
      */