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$return = ($hook = get_hook('ps_do_bbcode_start')) ? eval($hook) : null;
    if ($return !== null)
        return $return;

//
// Convert BBCodes to their HTML equivalent
//
function do_bbcode($text, $is_signature = false)
{
    global $lang_common, $forum_user, $forum_config;

    $return = ($hook = get_hook('ps_do_bbcode_start')) ? eval($hook) : null;
    if ($return !== null)
        return $return;

    if (strpos($text, '[quote') !== false)
    {
        $text = preg_replace_callback(
            '#\[quote=(&\#039;|"|"|\'|)(.*?)\\1\]#', function($matches) {
global $lang_common;
return '</p><div class="quotebox"><cite>'.str_replace(array('[', '"'), array('&#91;', '"'), $matches[2])." ".$lang_common['wrote'].":</cite><blockquote><p>";
},
$text);
        $text = preg_replace('#\[quote\]\s*#', '</p><div class="quotebox"><blockquote><p>', $text);
        $text = preg_replace('#\s*\[\/quote\]#S', '</p></blockquote></div><p>', $text);
    }

    if (!$is_signature)
    {
        $pattern_callback[] = '%\[list(?:=([1a*]))?+\]((?:(?>.*?(?=\[list(?:=[1a*])?+\]|\[/list\]))|(?R))*)\[/list\]%is';
        $replace_callback[] = 'handle_list_tag($matches[2], $matches[1])';
    }

    $pattern[] = '#\[b\](.*?)\[/b\]#ms';
    $pattern[] = '#\[i\](.*?)\[/i\]#ms';
    $pattern[] = '#\[u\](.*?)\[/u\]#ms';
    $pattern[] = '#\[colou?r=([a-zA-Z]{3,20}|\#[0-9a-fA-F]{6}|\#[0-9a-fA-F]{3})](.*?)\[/colou?r\]#ms';
    $pattern[] = '#\[h\](.*?)\[/h\]#ms';

    $replace[] = '<strong>$matches[1]</strong>';
    $replace[] = '<em>$matches[1]</em>';
    $replace[] = '<span class=\"bbu\">$matches[1]</span>';
    $replace[] = '<span style=\"color: $matches[1]\">$matches[2]</span>';
    $replace[] = '</p><h5>$matches[1]</h5><p>';

    if (($is_signature && $forum_config['p_sig_img_tag'] == '1') || (!$is_signature && $forum_config['p_message_img_tag'] == '1'))
    {
        $pattern[] = '#\[img\]((ht|f)tps?://)([^\s<"]*?)\[/img\]#';
        $pattern[] = '#\[img=([^\[]*?)\]((ht|f)tps?://)([^\s<"]*?)\[/img\]#';
        if ($is_signature)
        {
            $replace[] = '".handle_img_tag($matches[1].$matches[3], true)."';
            $replace[] = '".handle_img_tag($matches[2].$matches[4], true, $matches[1])."';
        }
        else
        {
            $replace[] = '".handle_img_tag($matches[1].$matches[3], false)."';
            $replace[] = '".handle_img_tag($matches[2].$matches[4], false, $matches[1])."';
        }
    }

    $text = preg_replace_callback('#\[url\]([^\[]*?)\[/url\]#', 'callback_handle_url_nobb', $text);
    $text = preg_replace_callback('#\[url=([^\[]+?)\](.*?)\[/url\]#', 'callback_handle_url_nobb', $text);

    $pattern[] = '#\[email\]([^\[]*?)\[/email\]#';
    $pattern[] = '#\[email=([^\[]+?)\](.*?)\[/email\]#';

    $replace[] = '<a href=\"mailto:$matches[1]\">$matches[1]</a>';
    $replace[] = '<a href=\"mailto:$matches[1]\">$matches[2]</a>';

    $return = ($hook = get_hook('ps_do_bbcode_replace')) ? eval($hook) : null;
    if ($return !== null)
        return $return;

    $count = count($pattern);
    for ($i = 0; $i < $count; $i++) {
        $text = preg_replace_callback($pattern[$i], function($matches) use ($replace, $i) {
                return eval('return "'.$replace[$i].'";');
            }, $text);
    }
    
    $count = count($pattern_callback);
    for ($i = 0; $i < $count; $i++) {
        $text = preg_replace_callback($pattern_callback[$i], function($matches) use ($replace_callback, $i) {
            return eval('return '.$replace_callback[$i].';');
        }, $text);
    }
    $return = ($hook = get_hook('ps_do_bbcode_end')) ? eval($hook) : null;
    if ($return !== null)
        return $return;

    return $text;
}