How to determine the jump between computer and mobile terminals in php

With the popularity of smartphones, more and more websites are beginning to focus on mobile adaptation. Many websites need to determine whether the user opens it on a computer or a mobile terminal in order to respond accordingly. This article will introduce the computer and mobile terminal judgment and jump methods written in PHP.

First of all, we need to understand some basic knowledge. Determining whether the current user is on a computer or a mobile terminal often relies on HTTP request headers. When we open a browser on a computer to visit a website, it will include "User-Agent" information in the HTTP request header, and when we open a browser on a mobile phone to visit a website, the request header will include "User-Agent" "Information is different. Therefore, we can determine whether the user opens it on the computer or on the mobile terminal by judging whether the "User-Agent" information in the request header contains the keyword of the mobile device.

Next, let’s take a look at how to determine the user device type in PHP. There is a built-in function in PHP called getallheaders() that can get all the information in the request header, and we can get the value of User-Agent from it. The code is as follows:

$headers = getallheaders(); 
$userAgent = $headers['User-Agent'];

The "User-Agent" information contains many keywords through which the user device type can be determined. For example, "User-Agent" contains keywords indicating mobile devices such as "Android", "iPhone", and "iPad". We can use regular expressions to determine whether $userAgent is a mobile device. The code is as follows:

if(preg_match('/iPhone|iPad|iPod|Android/i', $userAgent)){ 
    // 是移动设备
}else{ 
    // 不是移动设备
}

With the device type determined, we next need to jump to the device type. Here we take jumping to different pages as an example to illustrate. The code is as follows:

if(preg_match('/iPhone|iPad|iPod|Android/i', $userAgent)){
    header("Location: http://m.example.com"); // 跳转到移动端网站
    exit();  // 确保接下来的代码不再执行
}else{
    header("Location: http://www.example.com"); // 跳转到PC端网站
    exit();
}

Of course, if we don’t want to jump to the page, we can also control the display of different devices in other ways.

The above is how to use PHP to determine the type of computer and mobile devices. I hope it will be helpful to readers. For a better user experience, we should consider mobile adaptation issues when designing the website to improve the compatibility and ease of use of the page.

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