Auto Keyword String Generator

This PHP script simply takes the contents of a webpage, pasted onto a form, and by running a simple frequency analysis on the words in the page (excluding common words), it produces a list of the most common 1 word, 2 word and 3 word strings within the page. From this it builds a suitable keyword string which can be used within the meta tags of the originating page. It can often provide ideas for keywords which may have overlooked the author the page, who probably knows the theme too well.