如何更新codeigniter中的SVN文件夹

Question

I want to svn update application folder on codeigniter by click update button on my program, I have tried this code but nothing todo

I call Service by AJAX

$.ajax({
          url:"http://localhost/oneFarma/index.php/Welcome/version",  
          method:"post"




public function version(){
        echo shell_exec('cleanup C:\xampp\htdocs\oneFarma\application –-non-interactive');
        echo shell_exec('update 2>&1 C:\xampp\htdocs\oneFarma\application -–non-interactive');

    }

'update' is not recognized as an internal or external command, operable program or batch file