How to implement preview effect in WeChat applet with PHP

PHP is a very popular web development language and one of the commonly used backend development languages ​​in WeChat applet development. The preview effect of WeChat applet is very important for developers. They can check the actual effect of the application in time during the development process, and debug and improve the program. This article will introduce how to use PHP to achieve the preview effect in WeChat applet.

1. Understand the preview process of WeChat Mini Program

First of all, we need to understand the preview process of WeChat Mini Program. After developers have completed local development and debugging, they need to upload the mini program to the WeChat public platform and conduct release review in "Development Management". Before passing the review, we usually need to conduct a preview test to confirm the running status and page display of the mini program.

In the preview process of WeChat mini programs, developers need to first upload the mini program code to WeChat Developer Tools and conduct preview testing through the "Preview" function of WeChat Developer Tools. Developers can directly view the display effect of each page of the mini program in the WeChat developer tools, including interface style, page interaction, etc., and debug and modify it.

2. Use PHP to realize the preview effect of WeChat mini program

For PHP developers, how to use PHP to realize the preview effect of WeChat mini program? The following are some specific example operations:

1. Obtain the access_token of the mini program

Before using the WeChat developer tools to preview, we need to obtain the access_token of the mini program and save it. Come down. The function of obtaining access_token can be achieved through the following code:

$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=SECRET";

$res = file_get_contents($url);

$res = json_decode($res, true);

$access_token = $res['access_token'];

Among them, APPID and SECRET need to be replaced with the APPID and SECRET of your own mini program.

2. Generate the QR code of the mini program

After obtaining the access_token, we can use PHP to generate the preview QR code of the mini program. This can be achieved through the following code:

$url = 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' . $access_token;

$data = json_encode(array(
    'scene' => 'preview', // 可自定义参数
    'page' => 'pages/index/index', // 预览页面路径
    'width' => 430, // 二维码宽度
    'auto_color' => false, // 是否自动配置颜色
    'line_color' => array('r' => 0, 'g' => 0, 'b' => 0), // 颜色设置
    'is_hyaline' => true // 是否需要透明底色
));

$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);

curl_close($ch);

header('Content-Type: image/png');
echo $result;

Among them, it should be noted that the obtained QR code is returned in the form of a binary stream, and header('Content-Type: image/png') needs to be set. And output the results before they can be displayed normally in the browser.

3. Display the QR code information on the page

After obtaining the QR code, we can display it in the WeChat applet development tool. In the development tools, we can use the "picture" component to display the QR code. The page code can be written as:

<image src="二维码的URL地址" />

It should be noted that the URL address of the QR code needs to be replaced with the URL address of the actually generated QR code image.

3. Summary

The above are the steps to use PHP to achieve the preview effect of WeChat applet. By obtaining the access_token and generating the preview QR code, and displaying it on the page, we can quickly and conveniently conduct preview testing of the mini program, improving the efficiency and quality of program development.

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