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If you have a website that relies heavily on PRE tags, you know the important of converting PRE tag content to their HTML entities. Doing so prevents worlds of possible rendering issues.

// replaces pre content with html entities
function pre_entities($matches) {
	return str_replace($matches[1],htmlentities($matches[1]),$matches[0]);
}

// to html entities;  assume content is in the "content" variable
$content = preg_replace_callback('/<pre.*?>(.*?)<\/pre>/imsu',pre_entities, $content);