PHP check if it is mobile version

Nowadays, in the era of popular social networks, when people surf the Internet, their preferred device may have changed from traditional desktop computers to more flexible and portable mobile phones. In this environment, as a web developer or website administrator, how to detect whether the user is using a mobile device or a traditional desktop computer?

This issue is important for developers because they need to change the way pages are displayed based on the device accessing the website to achieve a better user experience. At the same time, some content is only for PCs, and some is only applicable to mobile phones, so it is necessary to determine the visitor's device type in order to select appropriate content.

PHP is a very popular programming language that provides several methods to determine the type of device used by the user. This article will introduce the PHP method to check whether it is a mobile phone, in order to provide help to PHP developers or website administrators.

1. Use HTTP User Agent (HTTP User Agent)

The most common method is to use HTTP User Agent (HTTP User Agent). When the browser initiates a request, it will include a User Agent identifier in the HTTP header. This identifier can tell us the name and version number of the browser, as well as the operating system and device model and other information. Developers can obtain a lot of information by parsing the User Agent, such as operating system, browser version, device model, device type, etc.

The following is a simple PHP code example for checking whether the user device is a mobile phone:

function is_mobile_device() {
    $user_agent = $_SERVER['HTTP_USER_AGENT'];
    return preg_match("/(Android|webOS|iPhone|iPod|BlackBerry|IEMobile|Opera Mini)/i", $user_agent);
}

if (is_mobile_device()) {
    echo "是手机端";
} else {
    echo "是PC端";
}

The $_SERVER['HTTP_USER_AGENT'] used in the above function is GET, POST, etc. The header information carried by the HTTP request. We save this information to the variable $user_agent, and finally determine whether it is a mobile device through regular expression matching.

In the regular expression, we list the more common mobile phone device models, including Android, webOS, iPhone, iPod, BlackBerry, IEMobile, Opera Mini, etc. When these keywords appear in the User Agent, it is considered to be a mobile phone type device.

However, this method is not a perfect detection method, and there will be some misjudgments. In some cases, the User Agent of the PC browser will be very similar to the User Agent of the mobile device, so in You still need to be careful when using it, especially in some cases when you have to distinguish between Android and iOS, the effect is not ideal.

2. Use third-party libraries

In addition to the above methods, you can also use some third-party libraries to determine whether it is a mobile phone type device. Commonly used ones include Mobile Detect and WURFL, which can be web server-side extensions or PHP class libraries referenced in the code.

Mobile Detect is a PHP class library that can be used to detect the type of device used by visitors, including mobile phones, tablets, and desktops. Its advantage is that it is rich in functions and supports the detection of many platforms and device models. How to use it:

include 'Mobile_Detect.php';
$detect = new Mobile_Detect;
if ($detect->isMobile()) {
    echo "是手机端";
} else {
    echo "是PC端";
}

WURFL Web device information library is a device library that classifies various smartphones, tablets, desktops, handheld PCs and other devices. The usage method is similar:

include_once 'WURFL/Serialize.php';
include_once 'WURFL/Client/Client.php';

$client = new \ScientiaMobile\WurflCloud\Client\Client('your_api_key', 'your_api_password');
$client->detectDevice();
if ($client->getDeviceCapability('is_wireless_device') == 'true') {
    echo "是手机端";
} else {
    echo "是PC端";
}

3. Use CSS media query

In addition to the above two methods, you can also use CSS Media Query to detect the device type. CSS Media Query is a new feature of CSS3 that sets different CSS styles for different devices or device states.

For example, we can define different styles for different device widths, as shown below:

/* PC端 */
@media screen and (min-width: 1024px) {
    body {
        font-size: 18px;
    }
}

/* 手机端 */
@media screen and (max-width: 768px) {
    body {
        font-size: 16px;
    }
}

By setting different media queries, we can set different styles for different device types, This enables multi-device adaptation.

Conclusion

For web developers and website administrators, judging the type of user device is of great significance, and PHP, as a very popular programming language, provides several A way to determine the type of device the user is using. In the process of realizing multi-device adaptation, we can use the above methods to determine the device type in order to show a better user experience.

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