How to implement carousel effect in PHP in WeChat mini program

As a popular social media application, WeChat has an increasing influence in the mobile Internet field. With the popularity of WeChat mini programs, more and more companies and developers are beginning to use WeChat mini programs to develop their own applications.

Carousel chart is one of the commonly used UI components in mini programs. Implementing the carousel effect can improve the user's interactive experience. This article will introduce how to use PHP to implement the carousel effect in WeChat mini programs.

1. Get data
   To achieve the carousel effect, you need to obtain the data of the carousel image first. In this example, we will use PHP to get the carousel information from the server.

We can use the following code to get data from the server:

$url = 'https://example.com/slides.json';
$data = file_get_contents($url);
$data = json_decode($data, true);

We can write a JSON file named slides.json on the server side with the file content It should look like this:

[
    {
        "image": "/images/slide1.jpg",
        "title": "Slide 1"
    },
    {
        "image": "/images/slide2.jpg",
        "title": "Slide 2"
    },
    {
        "image": "/images/slide3.jpg",
        "title": "Slide 3"
    }
]

The above code stores the obtained data in the $data array. Next, we need to pass the data to the front-end page.

2. Rendering carousel image
   In the front-end page, we can use the swiper component of the mini program to achieve the carousel effect. The following is a simple example:

<swiper autoplay="true" interval="3000" duration="500">
  <block wx:for="{{slides}}" wx:key="*this">
    <swiper-item>
      <image src="{{item.image}}" mode="aspectFill"></image>
      <text>{{item.title}}</text>
    </swiper-item>
  </block>
</swiper>

In the above code, we use the wx:for directive to traverse the carousel data and render each image and title to <swiper-item></swiper-item>In the component. The autoplay attribute is used to set automatic playback, the interval attribute sets the carousel time interval, and the duration attribute sets the speed of the carousel animation.

In the JavaScript code, we pass the obtained data to the data source of the rendered page:

Page({
  data: {
    slides: []
  },
  onLoad: function () {
    var that = this;
    wx.request({
      url: 'https://example.com/slides.json',
      success: function(res) {
        that.setData({
          slides: res.data
        })
      }
    })
  }
})

The above code stores the data obtained from the server in slides variable and pass it to the data source that renders the page.

3. Summary
   This article introduces the method of using PHP to achieve the carousel effect in WeChat applet, including obtaining data, rendering carousel images and transmitting data. By reading this article, readers can learn how to use PHP to write server-side programs and transfer server-side data to the WeChat applet to achieve a carousel effect.

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