PHP determines whether it is a mobile device

In this age of mobile devices, we may often need to use page matching for mobile devices when doing web front-end development. Of course, we can use responsive page design to handle the front-end matching problem, but the responsive page only does not display certain codes, but it will still be loaded into the user's mobile device.

In order to better take care of the user's mobile browsing experience and reduce unnecessary loading. We can then use PHP to reduce the user's code loading and improve the user's experience when browsing the page. (Recommended learning: PHP video tutorial)

Since there are now many types of mobile devices and various browsers, judging by UA alone cannot completely solve the problem.

The following is a ready-made PHP method for PHP to judge mobile devices

<?php
function isMobile()
{ 
    // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
    if (isset ($_SERVER[&#39;HTTP_X_WAP_PROFILE&#39;]))
    {
        return true;
    } 
    // 如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
    if (isset ($_SERVER[&#39;HTTP_VIA&#39;]))
    { 
        // 找不到为flase,否则为true
        return stristr($_SERVER[&#39;HTTP_VIA&#39;], "wap") ? true : false;
    } 
    // 脑残法，判断手机发送的客户端标志,兼容性有待提高
    if (isset ($_SERVER[&#39;HTTP_USER_AGENT&#39;]))
    {
        $clientkeywords = array (&#39;nokia&#39;,
            &#39;sony&#39;,
            &#39;ericsson&#39;,
            &#39;mot&#39;,
            &#39;samsung&#39;,
            &#39;htc&#39;,
            &#39;sgh&#39;,
            &#39;lg&#39;,
            &#39;sharp&#39;,
            &#39;sie-&#39;,
            &#39;philips&#39;,
            &#39;panasonic&#39;,
            &#39;alcatel&#39;,
            &#39;lenovo&#39;,
            &#39;iphone&#39;,
            &#39;ipod&#39;,
            &#39;blackberry&#39;,
            &#39;meizu&#39;,
            &#39;android&#39;,
            &#39;netfront&#39;,
            &#39;symbian&#39;,
            &#39;ucweb&#39;,
            &#39;windowsce&#39;,
            &#39;palm&#39;,
            &#39;operamini&#39;,
            &#39;operamobi&#39;,
            &#39;openwave&#39;,
            &#39;nexusone&#39;,
            &#39;cldc&#39;,
            &#39;midp&#39;,
            &#39;wap&#39;,
            &#39;mobile&#39;
            ); 
        // 从HTTP_USER_AGENT中查找手机浏览器的关键字
        if (preg_match("/(" . implode(&#39;|&#39;, $clientkeywords) . ")/i", strtolower($_SERVER[&#39;HTTP_USER_AGENT&#39;])))
        {
            return true;
        } 
    } 
    // 协议法，因为有可能不准确，放到最后判断
    if (isset ($_SERVER[&#39;HTTP_ACCEPT&#39;]))
    { 
        // 如果只支持wml并且不支持html那一定是移动设备
        // 如果支持wml和html但是wml在html之前则是移动设备
        if ((strpos($_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;
} 
?>

Currently, this method can be used for most mobile device judgments. You can add some UA judgment parameters as needed

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