PHP识别PC或者手机端访问

网站要判断是手机访问还是电脑访问，然后显示不同的信息或者加载不同的页面，亲测有效。

function isMobile(){    $userAgent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';    $userAgentCommentsBlock = preg_match('|\(.*?\)|', $userAgent, $matches) > 0 ? $matches[0] : '';    function CheckSubStr($subStr, $text)    {        foreach ($subStr as $item)        {            if (FALSE !== strpos($text, $item))            {                return TRUE;            }        }        return FALSE;    }    $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');    $found_mobile = CheckSubStr($mobile_os_list, $userAgentCommentsBlock) || CheckSubStr($mobile_token_list, $userAgent);    if ($found_mobile)    {        return TRUE;    }    else    {        return FALSE;    }}if (isMobile()){    echo '手机登录m.php100.com';}else{    echo '电脑登录www.php100.com';}