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Tidy filter from Hannes Gassert <hannes at mediagonal dot ch>
If you have Tidy installed as part of your PHP, you can use this
filter to convert all user text into XHTML on the fly.
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moodler committed Sep 23, 2004
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<?php

// This function looks for text including markup and
// applies tidy's repair function to it.
// Tidy is a HTML clean and
// repair utility, which is currently available for PHP 4.3.x and PHP 5 as a
// PECL extension from http://pecl.php.net/package/tidy, in PHP 5 you need only
// to compile using the --with-tidy option.
// If you don't have the tidy extension installed or don't know, you can enable
// or disable this filter, it just won't have any effect.
// If you want to know what you can set in $tidyoptions and what their default
// values are, see http://php.net/manual/en/function.tidy-get-config.php.

/**
* @author Hannes Gassert <hannes at mediagonal dot ch>
* @param int course id
* @param string text to be filtered
*/
function tidy_filter($courseid, $text) {

/// Configuration for tidy. Feel free to tune for your needs, e.g. to allow
/// proprietary markup.
$tidyoptions = array(
'output-xhtml' => true,
'show-body-only' => true,
'tidy-mark' => false,
'drop-proprietary-attributes' => true,
'drop-font-tags' => true,
'drop-empty-paras' => true,
'indent' => true,
'quiet' => true,
);

/// Do a quick check using strpos to avoid unnecessary work
if (strpos($text, '<') === false) {
return $text;
}


/// If enabled: run tidy over the entire string
if (function_exists('tidy_repair_string')){
$text = tidy_repair_string($text, $tidyoptions);
}

return $text;
}
?>

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