How does php determine whether access is from a mobile phone or a computer?

php method to determine whether it is mobile access or computer access: 1. If there is [HTTP_X_WAP_PROFILE], it must be a mobile device; 2. Find the keyword of the mobile browser from [HTTP_USER_AGENT]; 3. If only If it supports wml and does not support html, it must be a mobile device.

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How to determine whether access is via mobile phone or computer:

1. If there is HTTP_X_WAP_PROFILE, it must be a mobile device

//判断电脑还是手机访问
    function is_mobile(){ 
        
        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;
        }

2. Brainless method, judge the client flag sent by the mobile phone, the compatibility needs to be improved

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;
    } 
}

3. Protocol method, Because it may not be accurate, I will leave it to the final judgment

  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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