他是如何绕过注册10字符限制的？

public function transform($txt)<br />    {<br />        $txt = trim($txt);<br />        $txt = addslashes(htmlspecialchars($txt, ENT_QUOTES, "UTF-8"));<br />        if (preg_match_all("/\<fieldset><legend>Quote:</legend><blockquote>(.+?)\[\/quote]/is", $txt, $match)) {<br />            $txt = preg_replace('/\s*\r\n\s*/', '', $txt, 1);<br />        }<br />        $huanhang = array(<br />            "\r\n",<br />            "\n",<br />            "\r"<br />        );<br />        $txt      = str_replace($huanhang, '<br>', $txt);