在ThinkPHP Mobile中，怎么判断是否是移动端访问

public function isMobile() {
        // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
        if (isset ($_SERVER['HTTP_X_WAP_PROFILE'])){
            return true;
        }
        //如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
        if (isset ($_SERVER['HTTP_VIA'])) {
        //找不到为flase,否则为true
            return stristr($_SERVER['HTTP_VIA'], "wap") ? true : false;
        }
        
        //判断手机发送的客户端标志,兼容性有待提高
        if (isset ($_SERVER['HTTP_USER_AGENT'])) {
            $clientkeywords = array (
                    'nokia',
                    'sony',
                    'ericsson',
                    'mot',
                    'samsung',
                    'htc',
                    'sgh',
                    'lg',
                    'sharp',
                    'sie-',
                    'philips',
                    'panasonic',
                    'alcatel',
                    'lenovo',
                    'iphone',
                    'ipod',
                    'blackberry',
                    'meizu',
                    'android',
                    'netfront',
                    'symbian',
                    'ucweb',
                    'windowsce',
                    'palm',
                    'operamini',
                    'operamobi',
                    'openwave',
                    'nexusone',
                    'cldc',
                    'midp',
                    'wap',
                    'mobile'
            );
            // 从HTTP_USER_AGENT中查找手机浏览器的关键字
            if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {
                return true;
            }
        }
        //协议法，因为有可能不准确，放到最后判断
        if (isset ($_SERVER['HTTP_ACCEPT'])) {
            // 如果只支持wml并且不支持html那一定是移动设备
            // 如果支持wml和html但是wml在html之前则是移动设备
            if ((strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') !== false) && (strpos($_SERVER['HTTP_ACCEPT'], 'text/html') === false || (strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') < strpos($_SERVER['HTTP_ACCEPT'], 'text/html')))) {
                return true;
            }
        }
        return false;
    }

以上我的方法,  用var_dump($_SERVER)打印下SERVER就能明白

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