escape-code-tags-in-post.php

<?

//------------------------------------------------------------------------------
// Escape HTML tags in post content
add_filter('the_content', 'escape_code_fragments');

// Escape HTML tags in comments
add_filter('pre_comment_content', 'escape_code_fragments');

function escape_code_fragments($source) {
  $encoded = preg_replace_callback('/<code(.*?)>(.*?)<\/code>/ims',
  create_function(
    '$matches',
    '$matches[2] = preg_replace(
        array("/^[\r|\n]+/i", "/[\r|\n]+$/i"), "",
        $matches[2]);
      return "<code" . $matches[1] . ">" . esc_html( $matches[2] ) . "`";'
  ),
  $source);

  if ($encoded)
    return $encoded;
  else
    return $source;
}

?>

Used on my hiking blog