I'm sure this must have been suggested before, but I wasn't watching then...
When a comment form is generated, included a "magic number" as a hidden field. The only condition being that the number is unique. Then track those numbers which are submitted.
Depending on performance implications, either note the generation of the number, and strike it when the comment is submitted (and generate an error if the number is not found due to previously being struck), or simply record all those numbers submitted (and generate an error if the number has been previously seen). In either mechanism, flush entries from the cache after a certain time to keep it down to size.
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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