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Secure input and data handling is hard when it comes to HTML because of many different types of malicious code (XSS).

HTML Purifier is a well documented, standards-compliant HTML filter library written in PHP. It simply:

• Removes all malicious code (better known as XSS) with an audited, secure yet permissive whitelist.
• Makes sure your documents are standards compliant. 

HTML Purifier requires PHP 5  (PHP 4 versions are not supported any more but can be downloaded). It saves so much time while developing & offers much more expertise than most of the self-coded data-handling libraries as HTML Purifier is concentrated only in this area.

This open source secure data handling solution also has a comparison chart wih other HTML filters.

Some community-written plugins for CMS softwares, WYSIWYG editors can be found in the HTML Purifier website.

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