Another PHP Comment-despamming technique

Another method for de-spamming web log comments is illustrated in wordinbox.php. In this instance, a word is selected from a list; the user is asked to include the word in their post, the word being stripped automatically, when the form is submitted. It is assumed here that the word list used contains words with absolutely no relevance to the context in which they are used. The same could be done, incorporating relevant words into the text, obviating the need for stripping them later.