Description:
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From manual page: http://www.php.net/function.strip-tags
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The note documentation in the documentation for $allowed_tags reads:

In PHP 5.3.4 and later, you will also need to include the self-closing XHTML tag to strip these from str. For example, to strip both <br> and <br/>, you should use:

but that param is to allow, not to strip. It should probably read something like:

In PHP 5.3.4 and later, you will also need to include the self-closing XHTML tag to allow these in str. For example, to allow both <br> and <br/>, you should use: