PHP code sharing to determine where the visitor comes from

This article mainly shares with you the PHP code to determine where the visitor comes from. Regarding the PHP function to determine whether the visitor is a mobile phone or a PC, I hope it can help everyone.

/*移动端判断*/
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($_SERVER['HTTP_VIA'], "wap") ? true : false;
    } 
    // 脑残法，判断手机发送的客户端标志,兼容性有待提高
    if (isset ($_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'
            ); 
        // 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[&#39;HTTP_ACCEPT&#39;], &#39;vnd.wap.wml&#39;) !== false) && (strpos($_SERVER[&#39;HTTP_ACCEPT&#39;], &#39;text/html&#39;) === false || (strpos($_SERVER[&#39;HTTP_ACCEPT&#39;], &#39;vnd.wap.wml&#39;) < strpos($_SERVER[&#39;HTTP_ACCEPT&#39;], &#39;text/html&#39;))))
        {
            return true;
        } 
    } 
    return false;
}

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