I tend to use the isset function for checking my forms yada yada yada. I know allot of people just type their username and password in and then hit their keyboard [enter] key rather than pressing the [submit] button on the web page.

here is an example of the code i normally use:



Now, because people like me normally DON'T use the button lol, I was wondering what another good method would be to do all this. You know what I mean?

If the button is a submit button, pressing enter implies a click on the submit button. So you don't have to worry about it.

ahh okay, well sometimes when I type in a text field or something, I can hit enter but nothing appears because i didn't specifically click the [Submit] button. so if I don't have to worry than all is well.

Slight correction to what i said before. It turns out a bug exists in IE8 that makes your question something worth worrying about:
IE anomaly when using the enter key to submit a form

Synopsis:
Form with one text field and a submit button.
Type some text, press enter, the submit button doesn't get included in the post to the server.

Fix:
Add another text field (not a hidden field).

why not use a hidden field with a rand var for checkign to make sure that the form was submitted using normal methods? Its what i do.

something along the lines of

Set the $rand that was generated to a session, and then compare the key value to the session value to make sure it matches..