Optimize (swoft-cloud/swoft-component#143)

* Update PoolHelper.php

Fix typo

* Fix unit test

* Method \Swoole\Coroutine::call_user_func_array() has been removed in Swoole 4.0

src/Helper/PhpHelper.php

@@ -46,7 +46,11 @@ public static function call($cb, array $args = [])
             list($obj, $mhd) = $cb;
             $ret = \is_object($obj) ? $obj->$mhd(...$args) : $obj::$mhd(...$args);
         } else {
-            $ret = \Swoole\Coroutine::call_user_func_array($cb, $args);
+            if (SWOOLE_VERSION >= '4.0') {
+                $ret = call_user_func_array($cb, $args);
+            } else {
+                $ret = \Swoole\Coroutine::call_user_func_array($cb, $args);
+            }
         }
 
         return $ret;