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How do I grey out or disabled a button or checkboxes?

It can be seen, but can't be clicked or checked, unless something else is done first.

I am using HTML, PHP, and when necessary, JavaScript, to create a form, and PHP to interface the data entry or retrieve data with/from a MySQL database table.

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the xhtml-compliant way is to set the disabled attribute to "disabled" on the checkbox input element:

<input type="checkbox" disabled="disabled" />

if you don't care about xhtml and want to save a few characters, this will do the same thing:

<input type=checkbox disabled>

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Thanks for responding, misterhaan.

How would I do that interactively on webpage?

Let say there are radiobuttons A and B.

If A is selected, then checkbox C would be disabled. If B is selected, then checkbox C is enabled.

Do I do this in PHP? Or would it be best to be done in JavaScript?

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that's probably best done with javascript, but also make sure to check the input on the php side in case someone has javascript disabled.

i'm not sure how you would toggle disabled using javascript, but i would expect an answer to turn up if you search for "javascript checkbox disable"