PHP implementation of WeChat mini program poster generation techniques

With the rise of WeChat mini programs, many companies and individuals have begun to pay attention to the promotion and marketing of mini programs. In mini programs, posters, as a means commonly used to attract users, have become an indispensable part.

So, how to automatically generate posters? This article will provide some tips for generating WeChat mini program posters for developers who use PHP to develop mini programs.

1. Preparation

First, you need to create a mini program in the WeChat official account, and obtain the AppID, AppSecret, access_token and other information of the mini program in the developer center.

Next, install the PHP environment on your server, including the Apache server, PHP and GD extension libraries. The GD extension library is a PHP extension for generating images.

2. Obtain the mini program code

In order to generate a poster, you first need to generate the mini program code in the mini program. Mini program code can be generated by calling WeChat’s API.

In PHP, you can use the cURL function to obtain the mini program code by calling the interface provided by WeChat. The simple implementation code is as follows:

$appid = '你的小程序AppID';
$secret = '你的小程序AppSecret';
$path = '你的页面路径'; // 注意 一定要是已经发布的小程序页面，否则获取失败

// 获取 access_token
$url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$appid.'&secret='.$secret;
$response = curl_request($url);
$result = json_decode($response, true);
$access_token = $result['access_token'];

// 获取小程序码
$url = 'https://api.weixin.qq.com/wxa/getwxacode?access_token='.$access_token;
$params = array(
  'path' => $path,
  'width' => 430
);
$response = curl_request($url, 'POST', json_encode($params), array('Content-Type:application/json'));

// 保存小程序码
file_put_contents('path/to/save/wxacode.jpg', $response);

In the above code, we obtain the access_token of the mini program by calling the WeChat API, and pass in the page path and the generated 2D when calling the API that generates the mini program code. Code width. Next, we save the obtained applet code on the server for subsequent use.

3. Use the GD extension library to generate posters

After obtaining the small program code, we need to use PHP's GD extension library to synthesize it into a poster. The GD extension library allows PHP to synthesize images, add text and shapes, etc. It is a common extension library for PHP to generate images.

To use the GD extension library, we need to enable the GD extension library in PHP.

We can search for the keyword "extension=php_gd2.dll" or "extension=gd.so" in the PHP.ini file and uncomment this line to open the extension library. Or check whether the GD extension library is loaded by calling the function extension_loaded() in the code, as shown below:

if (!extension_loaded('gd')) {
  // GD 扩展库未加载
} else {
  // GD 扩展库已加载
}

Next, we define a function create_poster(), which accepts three parameters: a file path, a file path to the applet and a file path to return the generated poster file. In the create_poster() function, we load the template with the specified file path, add text and applet code using the GD extension library, and then save the generated poster to the specified path.

function create_poster($template, $wxacode, $output) {
  // 打开要生成的模版
  $bg_image = imagecreatefromjpeg($template);
  // 打开小程序码
  $wxacode_image = imagecreatefromstring(file_get_contents($wxacode));
  // 获取小程序码的宽高
  list($wxacode_width, $wxacode_height) = getimagesize($wxacode);

  // 创建新的画布
  $poster = imagecreatetruecolor(750, 1334);
  // 对图片进行重采样缩放
  imagecopyresampled($poster, $bg_image, 0, 0, 0, 0, 750, 1334, imagesx($bg_image), imagesy($bg_image));

  // 添加小程序码
  imagecopy($poster, $wxacode_image, 295, 810, 0, 0, $wxacode_width, $wxacode_height);

  // 添加文本
  $textColor = imagecolorallocate($poster, 255, 255, 255);
  $size = 24;
  $font = 'path/to/font.ttf';
  $text = '扫码进入小程序';
  imagettftext($poster, $size, 0, 187, 1133, $textColor, $font, $text);

  // 保存生成的海报
  imagejpeg($poster, $output, 80);
  // 释放内存
  imagedestroy($poster);
}

In the above code, we first open the template image at the specified path, load the applet code, then create a new canvas, and use the imagecopyresampled() method to scale the template image to the specified size. , and use the imagecopy() method to add the applet code to the canvas. Finally, we add the text to the canvas using the imagettftext() method and save the resulting poster to the specified path using the imagejpeg() method.

4. Add the poster to the mini program

After generating the poster, we can add it to the mini program.

You can use code similar to the following to let the mini program display the generated poster:

// 在 wxml 中添加 image 组件
<image src="{{posterImageUrl}}"></image>

// 在 js 中，设置海报图片的路径（posterImageUrl 是我们在 wxml 中绑定的变量名）
this.setData({
  posterImageUrl: 'path/to/generated/poster.jpg'
});

Use the above code to display the generated poster in the mini program.

Summary

In this article, we explain the techniques for using PHP to generate WeChat mini program posters, including obtaining the mini program code, using the GD extension library to generate posters, and adding posters to the mini program. .

Through the above techniques, we can easily generate posters with mini program codes and other elements, thereby improving the marketing promotion effect of mini programs.

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