Fatal error: Uncaught Error: Call to undefined function plugin_dir_path() in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\perfmatters\perfmatters.php:22 Stack trace: #0 {main} thrown in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\perfmatters\perfmatters.php on line 22