How to implement WeChat poster in php

In recent years, with the rapid development of social media, WeChat has become an indispensable part of people's daily lives. On WeChat, you can not only chat and communicate with relatives and friends, but also share your life and joy by publishing in Moments and other methods. In this process, we often need to make posters to record and share our beautiful moments. This article will introduce how to use PHP to create WeChat posters.

In order to realize the production of WeChat posters, we first need to know several key elements of WeChat posters, including the background image of the poster, the size and position of various elements, the color, font and size of the text, etc. PHP is a powerful server-side scripting language that can easily generate and process posters.

1. Get the materials

To make a beautiful poster, you first need to prepare the materials. These materials include background images, avatars, text, etc. We recommend using images in PNG format to ensure background transparency and clarity. You can use the following code to get WeChat user avatars:

$access_token = 'your-access-token';
$openid = 'your-openid';
$url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=".$access_token."&openid=".$openid."&lang=zh_CN";
$result = file_get_contents($url);
$json_result = json_decode($result);
$headimgurl = $json_result->headimgurl;

2. Generate poster

After we have the materials, we can start generating posters. We can use PHP's GD library to implement image processing. The GD library is a C language library that provides a series of functions for manipulating images. First, we need to create a canvas and place the required materials on the canvas.

// 1.创建画布
$canvas_width = 750;
$canvas_height = 1334;
$canvas = imagecreatetruecolor($canvas_width, $canvas_height);

// 2.获取背景图片
$background = imagecreatefrompng('background.png');
imagecopy($canvas, $background, 0, 0, 0, 0, $canvas_width, $canvas_height);

// 3.在画布上添加头像
$headimgurl = 'https://wx.qlogo.cn/mmopen/vi_32/XXXX/XXX/0';
$avatar = imagecreatefromjpeg($headimgurl);
imagecopymerge($canvas, $avatar, 50, 50, 0, 0, 200, 200, 100);

// 4.在画布上添加文字
$text = 'Hello,World!';
$font_size = 32;
$font_color = imagecolorallocate($canvas, 255, 255, 255);
$font_file = './font.ttf';
imagettftext($canvas, $font_size, 0, 300, 100, $font_color, $font_file, $text);

3. Save Poster

After making the poster, we need to save it on the server and return it to the user. You can use the following code to save the poster as an image in PNG format.

// 5.将海报保存为图片
$save_path = './poster.png';
imagepng($canvas, $save_path);

// 6.输出海报给用户
header('Content-Type: image/png');
echo file_get_contents($save_path);

// 7.释放画布和资源
imagedestroy($canvas);
imagedestroy($background);
imagedestroy($avatar);

At this point, a basic WeChat poster is completed. Of course, to achieve better results, it is necessary to continuously adjust the position, size, color, etc. of the materials, as well as perform more complex special effects processing.

Summary

This article mainly introduces how to use PHP to realize the production of WeChat posters. We need to prepare the materials and use PHP's GD library to process and generate posters. Finally, we need to save the poster on the server and output it to the user. Of course, this is only a basic step in WeChat poster production, and it still needs constant adjustment and optimization. I hope this article can bring some help to readers so that everyone can better enjoy the fun brought by WeChat.

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