过滤特殊字符(包括过滤emoji表情)

/**
     * 过滤特殊字符
     * @param $text
     * @return mixed
     */
    public static function filterSpecialChars($text)
    {
        //过滤emoji表情
        $a = json_encode($text);
        $b = preg_replace("/\ud([8-9a-f][0-9a-z]{2})/i", "", $a);
        $text = json_decode($b);

        //过滤特殊字符
        $pattern = "/[x{3400}-x{4DB5}x{4E00}-x{9FA5}x{9FA6}-x{9FBB}x{F900}-x{FA2D}x{FA30}-x{FA6A}x{FA70}-x{FAD9}x{FF00}-x{FFEF}x{2E80}-x{2EFF}x{3000}-x{303F}x{31C0}-x{31EF}x{2F00}-x{2FDF}x{2FF0}-x{2FFF}x{3100}-x{312F}x{31A0}-x{31BF}x{3040}-x{309F}x{30A0}-x{30FF}x{31F0}-x{31FF}x{AC00}-x{D7AF}x{1100}-x{11FF}x{3130}-x{318F}x{4DC0}-x{4DFF}x{A000}-x{A48F}x{A490}-x{A4CF}x{2800}-x{28FF}x{3200}-x{32FF}x{3300}-x{33FF}x{2700}-x{27BF}x{2600}-x{26FF}x{FE10}-x{FE1F}x{FE30}-x{FE4F}0-9a-zA-Z—x{21}-x{7e}x{00}-x{ff}]/ui";
        $filterStr = preg_replace($pattern, '', $text);
        $filterPattern = addslashes("/" . $filterStr . "/ui");
        return preg_replace($filterPattern, '', $text);
    }