判斷是手機訪問還是PC訪問

function ismobile() {
    // 如果有HTTP_X_WAP_PROFILE則一定是移動設備
    if (isset ($_SERVER['HTTP_X_WAP_PROFILE']))
        return true;
    
    //此條摘自TPM智能切換模板引擎，適合TPM開發
    if(isset ($_SERVER['HTTP_CLIENT']) &&'PhoneClient'==$_SERVER['HTTP_CLIENT'])
        return true;
    //如果via信息含有wap則一定是移動設備,部分服務商會屏蔽該信息
    if (isset ($_SERVER['HTTP_VIA']))
        //找不到爲flase,否則爲true
        return stristr($_SERVER['HTTP_VIA'], 'wap') ? true : false;
    //判斷手機發送的客戶端標誌,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'
        );
        //從HTTP_USER_AGENT中查找手機瀏覽器的關鍵字
        if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {
            return true;
        }
    }
    //協議法，因爲有可能不準確，放到最後判斷
    if (isset ($_SERVER['HTTP_ACCEPT'])) {
        // 如果只支持wml並且不支持html那一定是移動設備
        // 如果支持wml和html但是wml在html之前則是移動設備
        if ((strpos($_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;
 }