首先参考：Composer三步曲：安装、使用、发布
在 php 路径下，应能打开命令行输入php -v能够看到php版本信息。
然后执行以下三条：
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
php composer-setup.php
php -r "unlink('composer-setup.php');"这时遇到报错：
Unable to find the wrapper "https" - did you forget to enable it when you configured PHP?参考：https://www.cnblogs.com/ec04/p/12390050.html
1.windows下的PHP，只需要到php.ini中把extension=php_openssl.dll前面的;删掉，重启服务就可以了。
经查，我的 php 没有这一项，添加，然后 iisreset 。再次执行以上三条，通过，下载安装成功。
All settings correct for using Composer
Downloading...
Composer (version 2.7.7) successfully installed to: C:\php\composer.phar
Use it: php composer.phar
C:\php>php comoser.phar
Could not open input file: comoser.phar
C:\php>php composer.phar
______
/ ____/___ ____ ___ ____ ____ ________ _____
/ / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
/_/
Composer version 2.7.7 2024-06-10 22:11:12最后参考：php使用wkhtmltopdf html转为ptf或图片_php wkhtmlto-CSDN博客
执行：composer require mikehaertl/phpwkhtmltopdf
这时有问题，需要改为：php composer.phar require mikehaertl/phpwkhtmltopdf
执行通过：
./composer.json has been created
Running composer update mikehaertl/phpwkhtmltopdf
Loading composer repositories with package information
Updating dependencies
Lock file operations: 3 installs, 0 updates, 0 removals
- Locking mikehaertl/php-shellcommand (1.7.0)
- Locking mikehaertl/php-tmpfile (1.2.1)
- Locking mikehaertl/phpwkhtmltopdf (2.5.0)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 3 installs, 0 updates, 0 removals
- Downloading mikehaertl/php-tmpfile (1.2.1)
- Downloading mikehaertl/php-shellcommand (1.7.0)
- Downloading mikehaertl/phpwkhtmltopdf (2.5.0)
0/3 [>---------------------------] 0%
2/3 [==================>---------] 66%
3/3 [============================] 100%
- Installing mikehaertl/php-tmpfile (1.2.1): Extracting archive
- Installing mikehaertl/php-shellcommand (1.7.0): Extracting archive
- Installing mikehaertl/phpwkhtmltopdf (2.5.0): Extracting archive
0/3 [>---------------------------] 0%
3/3 [============================] 100%
Generating autoload files
No security vulnerability advisories found.
Using version ^2.5 for mikehaertl/phpwkhtmltopdf最后是如何使用：
（这里要吐槽一下：网上的示例为何都不讲 require_once('...') 呢？）
//定位文件位置
require_once('C:\php\vendor\mikehaertl\php-tmpfile\src\File.php');
require_once('C:\php\vendor\mikehaertl\php-shellcommand\src\Command.php');
require_once('C:\php\vendor\mikehaertl\phpwkhtmltopdf\src\Command.php');
require_once('C:\php\vendor\mikehaertl\phpwkhtmltopdf\src\Image.php');
require_once('C:\php\vendor\mikehaertl\phpwkhtmltopdf\src\Pdf.php');
//生成图片
use mikehaertl\wkhtmlto\Image;
//生成PDF
use mikehaertl\wkhtmlto\Pdf;
//生成HTML和CSS
$html = "
<!DOCTYPE html>
<html lang=\"en\">
<head>
<meta charset=\"UTF-8\">
<title>Title</title>
</head>
<style>
table {
border-collapse: collapse;
width: 100%;
max-width: 600px;
margin: 0 auto;
}
th, td {
border: 1px solid #ddd;
padding: 10px;
text-align: center;
}
th {
background-color:#f2f2f2;
}
</style>
<body>
<table>
<tr>
<th>姓名</th>
<th>年龄</th>
<th>性别</th>
</tr>
<tr>
<td>张三</td>
<td>20</td>
<td>男</td>
</tr>
<tr>
<td>李四</td>
<td>25</td>
<td>女</td>
</tr>
</table>
</body>
</html>";
//$html可以是文件路径也可以直接放html
$image = new Image($html);
// 懒得设置环境变量，直接把wkhtmltopdf安装路径写到这里就好
$image->binary = 'C:\Program Files\wkhtmltopdf\bin\wkhtmltoimage';
$image->saveAs('test.png');
$pdf = new Pdf($html);
// 懒得设置环境变量，直接把wkhtmltopdf安装路径写到这里就好
$pdf->binary = 'C:\Program Files\wkhtmltopdf\bin\wkhtmltopdf';
$pdf->saveAs('test.pdf');
