Taking care of HTML comments in PHP

A little problem came up with some user submitted content on a platform I’m working with.

A form allows users to submit content with tinyMCE. If the content is pasted from MS Word, the source is then littered with HTML conditional comments that can have a detrimental effect on the the page that returns it.

After discovering what was going on, I thought that the best time to capture the offending content is when the text is submitted. Using a regular expression, I can capture the HTML conditionals as well as remove any unnecessary comments:

function clear_html_comments($html)
    return preg_replace('/&lt;!--(.|\s)*?--&gt;/', '', $html);

That’s it. Just pass in the content from tinyMCE and it should prevent any content being returned that is in HTML comments.