bbcode parser

<?php

class bbcode {

    public static function tohtml($text, $advanced = FALSE, $charset = 'UTF-8') {

        //special chars
        $text = htmlspecialchars($text, ENT_QUOTES, $charset);

        /**
         * This array contains the main static bbcode
         * @var array $basic_bbcode
         */
        $basic_bbcode = array(
            '[b]', '[/b]',
            '[i]', '[/i]',
            '[u]', '[/u]',
            '[s]', '[/s]',
            '[ul]', '[/ul]',
            '[li]', '[/li]',
            '[ol]', '[/ol]',
            '[code]', '[/code]',
            '[center]', '[/center]',
            '[left]', '[/left]',
            '[right]', '[/right]',

        );

        /**
         * This array contains the main static bbcode's html
         * @var array $basic_html
         */
        $basic_html = array(
            '<b>', '</b>',
            '<i>', '</i>',
            '<u>', '</u>',
            '<s>', '</s>',
            '<ul>', '</ul>',
            '<li>', '</li>',
            '<ol>', '</ol>',
            '<div id="code">', '</div>',
            '<div style="text-align: center;">', '</div>',
            '<div style="text-align: left;">', '</div>',
            '<div style="text-align: right;">', '</div>',

        );

        /**
         *
         * Parses basic bbcode, used str_replace since seems to be the fastest
         */
        $text = str_replace($basic_bbcode, $basic_html, $text);

        //advanced BBCODE
        if ($advanced) {
            /**
             * This array contains the advanced static bbcode
             * @var array $advanced_bbcode
             */
            $advanced_bbcode = array(
                '#\[color=([a-zA-Z]*|\#?[0-9a-fA-F]{6})](.+)\[/color\]#Usi',
                '#\[size=([0-9][0-9]?)](.+)\[/size\]#Usi',
                '#\[quote](\r\n)?(.+?)\[/quote]#si',
                '#\[quote=(.*?)](\r\n)?(.+?)\[/quote]#si',
                '#\[url](.+)\[/url]#Usi',
                '#\[url=(.+)](.+)\[/url\]#Usi',
                '#\[email]([\w\.\-]+@[a-zA-Z0-9\-]+\.?[a-zA-Z0-9\-]*\.\w{1,4})\[/email]#Usi',
                '#\[email=([\w\.\-]+@[a-zA-Z0-9\-]+\.?[a-zA-Z0-9\-]*\.\w{1,4})](.+)\[/email]#Usi',
                '#\[img](.+)\[/img]#Usi',
                '#\[img=(.+)](.+)\[/img]#Usi',
                '#\[code](\r\n)?(.+?)(\r\n)?\[/code]#si',
                '#\[youtube]http://[a-z]{0,3}.youtube.com/watch\?v=([0-9a-zA-Z]{1,11})\[/youtube]#Usi',
                '#\[youtube]([0-9a-zA-Z]{1,11})\[/youtube]#Usi'
            );

            /**
             * This array contains the advanced static bbcode's html
             * @var array $advanced_html
             */
            $advanced_html = array(
                '<span style="color: $1">$2</span>',
                '<span style="font-size: $1px">$2</span>',
                "<div class=\"quote\"><span class=\"quoteby\">Quote:</span>\r\n$2</div>",
                "<div class=\"quote\"><span class=\"quoteby\"><b>$1</b> Wrote:</span>\r\n$3</div>",
                '<a rel="nofollow" target="_blank" href="$1">$1</a>',
                '<a rel="nofollow" target="_blank" href="$1">$2</a>',
                '<a href="mailto: $1">$1</a>',
                '<a href="mailto: $1">$2</a>',
                '<img src="$1" alt="$1" />',
                '<img src="$1" alt="$2" />',
                '<div class="code">$2</div>',
                '<object type="application/x-shockwave-flash" style="width: 450px; height: 366px;" data="http://www.youtube.com/v/$1"><param name="movie" value="http://www.youtube.com/v/$1" /><param name="wmode" value="transparent" /></object>',
                '<object type="application/x-shockwave-flash" style="width: 450px; height: 366px;" data="http://www.youtube.com/v/$1"><param name="movie" value="http://www.youtube.com/v/$1" /><param name="wmode" value="transparent" /></object>'
            );

            $text = preg_replace($advanced_bbcode, $advanced_html, $text);
        }

        //before return convert line breaks to HTML
        return bbcode::nl2br($text);
    }


    //+++++++++++++++++++++++++++++++++++++

    public static function remove($text) {
        return strip_tags(str_replace(array('[', ']'), array('<', '>'), $text));
    }

    /**
     *
     * Inserts HTML line breaks before all newlines in a string
     * @param string $var
     */
    public static function nl2br($var) {
        return str_replace(array('\\r\\n', '\r\\n', 'r\\n', '\r\n', '\n', '\r'), '<br />', nl2br($var));
    }

}