Implementation method of multimedia content display developed in PHP in WeChat mini program

With the rapid development of the mobile Internet, WeChat mini programs have become the preferred platform for many companies and individual entrepreneurs. Among them, multimedia content display is one of the hot spots that many small program developers pay attention to. One of the ways to achieve multimedia content display is to use PHP development. This article will introduce how to use PHP to implement multimedia content display in WeChat mini programs.

1. Develop multimedia content with PHP

First of all, we need to understand the basic knowledge of PHP. PHP is a common server-side scripting language, mainly used for the development of dynamic web pages, and can also be used for writing command line interfaces. When displaying multimedia content, we can choose to use PHP to process and display images, videos and other content.

In PHP, the main functions for processing images are imagecreatefromxxx, imagecopyresampled, etc.; while the main functions for processing videos are ffmpeg, mencoder, etc. Taking image processing as an example, here is a code example for using PHP to convert image formats:

<?php
$file = "./images/test.jpg";
$image = imagecreatefromjpeg($file);
$newfile = "./images/test.png";
imagepng($image,$newfile);
imagedestroy($image);
?>

In the above code, we first use the imagecreatefromjpeg function to read the specified JPG file; then save the image as PNG format, and use the imagedestroy function to release image resources. When we display images in the mini program, we only need to present the converted PNG format image directly on the front end.

2. PHP calls in WeChat mini programs

Since the development process of WeChat mini programs requires the use of front-end technologies such as JavaScript, WXML and WXSS, PHP cannot be used directly for development. In order to realize the interaction between PHP and small programs, we need to use a method called "middle layer" to call PHP files.

In the mini program, you can use the wx.request function to send HTTP requests. The role of the middle layer is to forward the request to the PHP program for execution and return the execution result of the PHP program. Here is a code example that uses the middle layer to call PHP to process images in a small program:

// 在前端代码中
wx.request({
  url: 'https://example.com/api/upload.php',
  method: 'POST',
  data: {
    image: 'base64data'
  },
  success: function(res) {
    console.log(res)
    // 通过res.data可以获得PHP程序返回的结果
  }
})

// 在PHP文件中
<?php
header("Content-Type:text/html; charset=utf-8");
$data = $_POST['image'];
$decodedData = base64_decode($data);
file_put_contents('./uploads/test.jpg', $decodedData);
?>

In the above code, we first use the wx.request function in the front-end code to send a POST request, and the pending The image is passed to the backend in base64 encoding. After receiving the request, the back-end PHP file decodes the base64 data in the request parameters and stores it as a JPG format file.

It should be noted that due to the data transmission rules of HTTP requests in WeChat applet, the PHP program must display and set the Content-Type code through the header function to ensure the correct transmission method.

3. Summary

In this article, we introduced the method of using PHP to realize multimedia content display in WeChat mini programs, and explained in detail how to use the middle layer to connect the front and back ends. During the actual development process, you also need to pay attention to the security issues of mini programs, such as preventing XSS attacks, SQL injection and other common problems, to ensure user privacy and data security. I hope this article can provide some practical operating skills for PHP developers.

The above is the detailed content of Implementation method of multimedia content display developed in PHP in WeChat mini program. For more information, please follow other related articles on the PHP Chinese website!