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>>If a stand-along controller, but you use a POST, then the signature would be Login::index() and you would use $this->input->post('email') to retrieve the parameter.

I created Subit_backend.php and put it in the controllers directory. What does it mean "the signature would be Login::index()"? Can you point me at some part of the documentation that describes setting up such a thing? I have no idea what "::" means.

thx

That is just a generic notation for the "index" method inside the "Login" controller.
It's probably more from the Java world than PHP, but I find it gets the message across.
See https://docs.oracle.com/javase/tutorial/...ences.html

If "Subit_backend" is the endpoint that you want to use for login, using its default method, then that signature would be "Subit_backend::index()", where the empty parameter list implies no arguments. If you want parameters for an "index" method, then you could set up a routing rule for that, or else extract the parameters programmatically.
See https://www.codeigniter.com/user_guide/g...llers.html