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php判斷訪問來源是PC還是手機端

    function isMobile() {
        // 如果有HTTP_X_WAP_PROFILE則一定是移動裝置
        if (isset ($_SERVER['HTTP_X_WAP_PROFILE'])) {
            return true;
        }
        //如果via資訊含有wap則一定是移動裝置,部分服務商會遮蔽該資訊
        if (isset ($_SERVER['HTTP_VIA'])) {
            //找不到為flase,否則為true
            return stristr($_SERVER['HTTP_VIA'], "wap") ? true : false;

        }
        //腦殘法,判斷手機發送的客戶端標誌,相容性有待提高
        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中查詢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,因為有可能不準確,放到最後判斷
        if (isset ($_SERVER['HTTP_ACCEPT'])) {
            // 如果只支援wml並且不支援html那一定是移動裝置
            // 如果支援wml和html但是wml在html之前則是移動裝置
            if ((strpos($_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;
    }