valid value for name attribute in html

Question

I use PHP to get radio button values from a html page. My html looks like this:

Answer 1

Try substituting the period for something else like a hyphen. In both the form and the php code. Periods are generally used for a . in the extension name. When it comes to key names for parameters in either get or post headers, you want to only use alphanumeric characters, with some special characters generally. Such as hyphens, underscores, etc. You can always do a URL encode if you need to as well.