Is there a way to detect where an enter has been entered into a text field?

I know how to check a value for a character but what is it I search for?

I don't know that you can detect an ENTER in a text field (i.e., <input type="text">), but you can in a <textarea> -- it is represented as a newline character ("\n").

Sorry, I meant to say in a text area. So I should search the value for \n?

Without running a quick test, I would say yes -- I'm sure that's right.

\n is a control sequence, so include it within double quotes and PHP will treat the \n sequence as a literal newline character.