<?php

class IsMobile {

    public static function isMobile()

    {

        $useragent=isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';

        $useragent_commentsblock=preg_match('|\(.*?\)|',$useragent,$matches)>0?$matches[0]:'';

        $mobile_os_list = array('Google Wireless Transcoder','Windows CE','WindowsCE','Symbian','Android','armv6l','armv5','Mobile','CentOS','mowser','AvantGo','Opera Mobi','J2ME/MIDP','Smartphone','Go.Web','Palm','iPAQ');

        $mobile_token_list = array('Profile/MIDP','Configuration/CLDC-','160×160','176×220','240×240','240×320','320×240','UP.Browser','UP.Link','SymbianOS','PalmOS','PocketPC','SonyEricsson','Nokia','BlackBerry','Vodafone','BenQ','Novarra-Vision','Iris','NetFront','HTC_','Xda_','SAMSUNG-SGH','Wapaka','DoCoMo','iPhone','iPod');

        $found_mobile = self::CheckSubstrs($mobile_os_list, $useragent_commentsblock) ||

                        self::CheckSubstrs($mobile_token_list,$useragent);

        if ($found_mobile){

            return true;

        }else{

            return false;

        }

    }

    public static function CheckSubstrs($substrs,$text)

    {

        foreach($substrs as $substr)

            if(false!==strpos($text,$substr)){

            return true;

        }

        return false;

    }

}

/*test code

if (IsMobile::isMobile())

    echo '手机登录www.nginx.cn';

else

    echo '电脑登录www.nginx.cn';

*/

?>

function isPhone() {

    // 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

        if(stristr($_SERVER['HTTP_VIA'], "wap"))

        {

            return true;

        }

    }

    //脑残法，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',

            'phone',

        );

        // 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;

}

js区分手机或PC访问源码

方法一

<!--切换手机版网站--->

<script src="http://siteapp.baidu.com/static/webappservice/uaredirect.js" type="text/javascript"></script>

<script type="text/javascript">uaredirect("http://www.nginx.cn/");</script>

方法二

<script type="text/javascript">

    <!-- //平台、设备和操作系统

    var system ={

        win : false,

        mac : false,

        xll : false

    };

    //检测平台

    var p = navigator.platform;

    system.win = p.indexOf("Win") == 0;

    system.mac = p.indexOf("Mac") == 0;

    system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);

    //跳转语句，如果是手机访问就自动跳转到wap.baidu.com页面

    if(system.win||system.mac||system.xll){

        window.location.href="http://www.kdw.cc";

    }else{

        window.location.href="http://m.kdw.cc";

    }

    -->

</script>