WordPress Speed Up Service | WordPress Website Maintenance Packages I have created one plugin in which i want to copy one file from plugin on WordPress root directory to run my embed code.Right Now i copy one file lets assume test.php on WordPress root directory but when other user try to login in WordPress Getting error on WordPress login page.It echos content from test.php on WordPress login page.And when i entered login details its giving an error. ERROR: Cookies are blocked due to unexpected output. For help, please see this documentation or try the support forums. please explain how to create php file on WordPress root directory.?