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Whenever display text in an HTML document I always put it through htmlentities for a number of reasons. One of the reasons is that if the text contains HTML, I want the browser to display the HTML code, not render it.
The application I am writing requires that I still encode using htmlentities but hyper links need to be left alone.
Is there a way to do this efficiently using existing functions or do I need to implement this functionality?
You can roll your own format (or use bbcode, markdown or others).
You can parse HTML (using a proper library; not regex, please) and selectively keep all the <a> tags.
You can use regex to allow an HTML-like <a>-tag syntax, say in the form of
but keep in mind that it will not be HTML. (HTML allows
relto be specified beforehref, for starters.)Also see this question; particularly the comments to my answer.