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Hiveminds | Mon, 2005-05-16 12:36 tags:

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Here you will find solutions to problems with stripping HTML from program and user input.

Route pages without mod_ rewrite

Translate html characters to html enties in array

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Hiveminds posted on: Mon, 2005-05-16 12:41.

PHP - How can I leave HTML comments when using strip tags()?

PHP 4.3 and above strip out the HTML comment tag and do not make exception for them in the allowable_tags parameter.

Answer:

Create a custom function that uses strip_tags() but removes comment tags before and after strip_tags() is used.

<?php

<?php
function strip_tags_c($string, $allowed_tags = '')
{
   $allow_comments = ( strpos($allowed_tags, '<!-->') !== false );
   if( $allow_comments )
   {
       $string = str_replace(array('<!--', '-->'), array('&lt;!--', '--&gt;'), $string);
       $allowed_tags = str_replace('<!-->', '', $allowed_tags);
   }
   $string = strip_tags( $string, $allowed_tags );
   if( $allow_comments ) $string = str_replace(array('&lt;!--', '--&gt;'), array('<!--', '-->'), $string);
   return $string;
}
$text = '<p>Test paragraph.</p><!-- Comment --> &lt;!-- Comment 2 --&gt;Other text</p>';
echo '1)'.$text;
echo strip_tags_c('2)'.$text);
echo "n";
// Allow <p>
echo strip_tags_c('<br>3)'.$text, '<p>,<!-->');
?>