How to make internal link between lots of articles?
<p>I have a huge data of articles and i want make link to connect one article to another article.
e.g. I have an article, "this is all about computer science". then computer science become  link that have address of another computer science article.
Like i set some keywords and according to that matching keyword will become a link like Wikipedia. i want this is php.</p>

<p>I used some regular expression but that are not working properly.</p>
