MyBB Code Interpreter

    public function formatPost( $text ) {
        // BBcode array
        $find = array(
            '~\[center\](.*?)\[/center\]~si',
            '~\[right\](.*?)\[/right\]~si',
            '~\[b\](.*?)\[/b\]~si',
            '~\[i\](.*?)\[/i\]~si',
            '~\[u\](.*?)\[/u\]~si',
            '~\[quote\](.*?)\[/quote\]~si',
            '~\[size=(.*?)\](.*?)\[/size\]~si',
            '~\[color=(.*?)\](.*?)\[/color\]~si',
            '~\[url\]((?:ftp|https?)://.*?)\[/url\]~si',
            '~\[img\](https?://.*?\.(?:jpg|jpeg|gif|png|bmp))\[/img\]~si'
        );
        // HTML tags to replace BBcode
        $replace = array(
            '<center>$1</center>',
            '<span style="float:right">$1</span>',
            '<b>$1</b>',
            '<i>$1</i>',
            '<span style="text-decoration:underline;">$1</span>',
            '<pre>$1</'.'pre>',
            '<span style="font-size:$1px;">$2</span>',
            '<span style="color:$1;">$2</span>',
            '<a href="$1">$1</a>',
            '<img src="$1" alt="" />'
        );
        // Replacing the BBcodes with corresponding HTML tags
        return nl2br(preg_replace($find,$replace,$text));
    }