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Код

    function bbcodes($text) {

        $text = htmlspecialchars($text);

        $text = preg_replace("/\[php\](.*)\[\/php\]/Usie", "'
         <table border=0 width=100% id=table1 cellspacing=1 cellpadding=0 bgcolor=#000000>
                <tr>
                    <td bgcolor=#FFFFFF>Код PHP</td>
                </tr>
                <tr>
                    <td bgcolor=#EEEEEE><font size=2>'.highlight_string('$1', true).'</font></td>
                </tr>
            </table>'", $text);

        $text = preg_replace("/\[b\](.*)\[\/b\]/Usi", "<b>\\1</b>", $text);
        $text = preg_replace("/\[i\](.*)\[\/i\]/Usi", "<i>\\1</i>", $text);
        $text = preg_replace("/\[u\](.*)\[\/u\]/Usi", "<u>\\1</u>", $text);
        $text = preg_replace("/\[s\](.*)\[\/s\]/Usi", "<s>\\1</s>", $text);

        $text = preg_replace("/\[color=(\#[0-9a-f]{3,6}|[a-z]+)\](.*)\[\/color\]/Usi", "<span style=\"color:\\1;\">\\2</span>", $text);
        $text = preg_replace("/\[size=([1-2]?[0-9])\](.*)\[\/size\]/Usi", "<span style=\"font-size:\\1px;\">\\2</span>", $text);
        $text = preg_replace("/\[font=([a-z]+)\](.*)\[\/font\]/Usi", "<span style=\"font-family:\\1;\">\\2</span>", $text);

        $text = preg_replace("/\[quote\](.*)\[\/quote\]/Usi", "<table border=\"0\" width=\"100%\" id=\"table1\" cellspacing=\"1\" cellpadding=\"0\" bgcolor=\"#000000\"><tr><td bgcolor='#FFFFFF'><font color='#000000'>Цитата:</font></td></tr><tr><td bgcolor=\"#FFFFFF\"><font color='#000000'>\\1</font></td></tr></table>", $text);
        $text = preg_replace("/\[code\](.*)\[\/code\]/Usi", "<table border=\"0\" width=\"100%\" id=\"table1\" cellspacing=\"1\" cellpadding=\"0\" bgcolor=\"#FF0000\"><tr><td bgcolor='#FFFFFF'><font color='#000000'>Код:</font></td></tr><tr><td bgcolor=\"#FFFFFF\"><pre class=\"code\"><font color='#000000'>\\1</font></pre></td></tr></table>", $text);

        $text = preg_replace("/\[img=(.*?)\](.*)\.(gif|jpg|jpeg|png)\[\/img\]/Usi", "<img src=\"\\2.\\3\" align=\"\\1\" style=\"border: none;\" />", $text);
        $text = preg_replace("/\[img\](.*)\.(gif|jpg|jpeg|png)\[\/img\]/Usi", "<img src=\"\\1.\\2\" alt=\"\" />", $text);
        $text = preg_replace("/\[email\]([a-z0-9_\-]+@[a-z0-9_\-\.]+\.[a-z]{2,6})\[\/email\]/Usi", "<a href=\"mailto:\\1\">\\1</a>", $text);
        $text = preg_replace("/\[email=([a-z0-9_\-]+@[a-z0-9_\-\.]+\.[a-z]{2,6})\](.*)\[\/email\]/Usi", "<a href=\"mailto:\\1\">\\2</a>", $text);

        $text = preg_replace("/\[url\](http:\/\/[a-z0-9_\-\.\/]+)\[\/url\]/Usi", "<a href=\"\\1\">\\1</a>", $text);
        $text = preg_replace("/\[url\](www\.[a-z0-9_\-\.\/]+)\[\/url\]/Usi", "<a href=\"http://\\1\">\\1</a>", $text);
        $text = preg_replace("/\[url=(http:\/\/[a-z0-9_\-\.\/]+)\](.*)\[\/url\]/Usi", "<a href=\"\\1\">\\2</a>", $text);
        $text = preg_replace("/\[url=(www\.[a-z0-9_\-\.\/]+)\](.*)\[\/url\]/Usi", "<a href=\"http://\\1\">\\2</a>", $text);

        $text = preg_replace("/\[left\](.*)\[\/left\]/Usi", "<div style=\"text-align: left;\">\\1</div>", $text);
        $text = preg_replace("/\[right\](.*)\[\/right\]/Usi", "<div style=\"text-align: right;\">\\1</div>", $text);
        $text = preg_replace("/\[center\](.*)\[\/center\]/Usi", "<div style=\"text-align: center;\">\\1</div>", $text);

        $text = preg_replace("/\[indent\](.*)\[\/indent\]/Usi", "<div style=\"padding-left: 20px;\">\\1</div>", $text);

        preg_match_all("/\[list\](.*)\[\/list\]/Usi", $text, $lists);
        
        foreach ($lists[1] as $el) {

            $elems_array = explode("[*]", $el);

            for($i=1; $i<count($elems_array); $i++) {
                $elems_str .= "<li>".trim($elems_array[$i])."</li>";
            }

            $text = preg_replace("/\[list\]".preg_quote($el, "/")."\[\/list\]/Usi", "<ul>".$elems_str."</ul>", $text);
        }

        return $text;
    }