How to implement automatic jump to mobile page in php

In web design, automatically jumping to the mobile page is very important for the website. As more and more people use mobile phones to browse websites, having a synchronized and efficient website access experience has become a must-have advantage. In PHP, how to automatically jump to the mobile page? This article will discuss this issue.

1. Determine the current device

In PHP, to automatically jump to the page on the mobile phone, you first need to determine the type of device currently being accessed. There are different ways to do this, one common way is to detect the HTTP request header information (HTTP_USER_AGENT) to get information about the current device. Generally, the request header information of mobile phones and computers is different. By detecting these lists, the type of device currently being accessed can be determined.

The following is a PHP code example to determine the current device type:

$is_mobile = false; // 初始化变量为false，表示当前设备类型不是移动设备

// 检测HTTP_USER_AGENT请求头信息，判断当前设备类型
if(isset($_SERVER['HTTP_USER_AGENT'])){

    $user_agents = array("iPhone","iPad","Android","webOS","BlackBerry","iPod","Symbian","IsGeneric");

    foreach($user_agents as $ua){
        if(strpos($_SERVER['HTTP_USER_AGENT'], $ua) !== false){
            // 判断是否为移动设备，如果包含上述字符串，即表示为移动设备
            $is_mobile = true;
            break;
        }
    }
}

2. Jump according to the device type

After obtaining the current device type, next You can automatically jump to the corresponding page based on the device type. This is also one of the keys to achieving mobile adaptation.

Taking the homepage of the site as an example, the following code shows how to jump to the corresponding page according to different device types:

if($is_mobile){ 
    header('Location: /m/index.php'); // 跳转到移动端首页地址
    exit(); 
}
else{  
    header('Location: /index.php'); // 跳转到PC端首页地址
    exit(); 
}

The above code implements the following logic:

• If the current device type is a mobile device, jump to the mobile homepage address (/m/index.php)
• If the current device type is PC, jump to the PC homepage address (/index .php)

It is worth noting that if the mobile page and PC page of the site are completely different, such as page structure, style, etc., you need to Each page creates a different file.

3. Optimize automatic jump

When implementing automatic jump, you should pay attention to the following issues:

1. Detect whether cache is used

When automatically jumping to the corresponding page, you should pay attention to whether the browser's cache has been updated. If the browser cache is not updated, the automatic redirect will fail. Therefore, you need to check whether the cache setting is disabled and whether the relevant HTTP header settings are reasonable.

The following is an example:

if($is_mobile){ 
    header('Cache-Control: no-cache, no-store, must-revalidate');
    header('Pragma: no-cache');
    header('Expires: 0');
    
    header('Location: /m/index.php'); // 跳转到移动端首页地址
    exit(); 
}
else{  
    header('Cache-Control: no-cache, no-store, must-revalidate');
    header('Pragma: no-cache');
    header('Expires: 0');
    
    header('Location: /index.php'); // 跳转到PC端首页地址
    exit(); 
}

2. Avoid infinite jumps

When implementing automatic jump code, special attention needs to be paid to avoid infinite jumps Case. Once this problem occurs, the page will not be displayed correctly when users visit the site.

The following is a sample code to avoid infinite jumps:

if(isset($_SERVER['HTTP_REFERER']) && strpos($_SERVER['HTTP_REFERER'], 'http(s)://'.$_SERVER['HTTP_HOST']) !== false){
    // 如果当前访问页地址与目标跳转页地址一致，则不进行跳转
    exit(); 
}

if($is_mobile){ 
    header('Cache-Control: no-cache, no-store, must-revalidate');
    header('Pragma: no-cache');
    header('Expires: 0');
    
    header('Location: /m/index.php'); // 跳转到移动端首页地址
    exit(); 
}
else{  
    header('Cache-Control: no-cache, no-store, must-revalidate');
    header('Pragma: no-cache');
    header('Expires: 0');
    
    header('Location: /index.php'); // 跳转到PC端首页地址
    exit(); 
}

In the above code, this logic implements the following two functions:

• If the address of the currently visited page is consistent with the address of the target jump page, no jump will be made
• Avoid infinite jumps and avoid code errors that lead to infinite jumps and website crashes

4. Summary

Automatically jumping to the page on the mobile phone is a very important part of web development, which can help the site improve access efficiency and user experience. To implement automatic jump in PHP, you can determine the current device type and then jump according to the corresponding page. By optimizing and improving the automatic jump code, we can ensure the smooth completion of the jump function, bring a better user experience, and improve website performance.

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