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.phpphp -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