PHP致命错误：在非对象上调用成员函数post（）

So I am trying to change up my url path to match the name of my SQL tables.

I have an html page that follows a form, after the user clicks Create it runs the following JS code:

if (form.EventID.value && confirm("Are you sure you want to create: " + form.EventID.value + "?")) {
        form.action = '/srv/events/create';
    }

Which in theory should link to the following php statement:

$app->post('/events/create', function () {

    $args = $_POST;

    CreateSQL('events', $args, DefineEventFields());

});

What was before was '/event/create' and it worked with no problems, all I did was ann an 's' to the end of event and now it throws me these errors:

PHP Notice: Undefined variable: app in ... PHP Fatal error: Call to a member function post() on a non-object in ...

What could be the issue?

The error message is pretty clear:

Call to a member function post() on a non-object

You are calling the member function post() on a non-object: $app

You have to find out why $app has not been initialized.

Your form action points to '/srv/events/create' change it to '/events/create'