1、执行：composer install 时，提示：enqueue/rdkafka 0.10.19 requires ext-rdkafka -> it is missing from your system. Install or enable PHP’s rdkafka extension.。如图1
PS E:\wwwroot\object> composer install
Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Your lock file does not contain a compatible set of packages. Please run composer update.
Problem 1
- enqueue/rdkafka is locked to version 0.10.19 and an update of this package was not requested.
- enqueue/rdkafka 0.10.19 requires ext-rdkafka ^4.0|^5.0|^6.0 -> it is missing from your system. Install or enable PHP's rdkafka extension.
To enable extensions, verify that they are enabled in your .ini files:
- C:\php-7.4.27\php.ini
You can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode.
Alternatively, you can run Composer with `--ignore-platform-req=ext-rdkafka` to temporarily ignore these required extensions.
2、决定启用 PHP 的 rdkafka 扩展。打开：https://pecl.php.net/package/rdkafka/6.0.1/windows ，下载 7.4 Thread Safe (TS) x64。解压缩 php_rdkafka-6.0.1-7.4-ts-vc15-x64 后，将 php_rdkafka.dll 复制至：C:\php-7.4.27\ext\php_rdkafka.dll。然后编辑 php.ini，添加 extension=rdkafka
3、重新启动 PHP 时，报错：PHP Warning: PHP Startup: Unable to load dynamic library ‘rdkafka’。如图2
PS C:\Users\Lenovo> php-cgi.exe -b 127.0.0.1:9000-c C:/php-7.4.27/php.ini
PHP Warning: PHP Startup: Unable to load dynamic library 'rdkafka' (tried: C:/php-7.4.27/ext\rdkafka (鎵句笉鍒版寚瀹氱殑妯″潡銆?, C:/php-7.4.27/ext\php_rdkafka.dll (鎵句 笉鍒版寚瀹氱殑妯″潡銆?) in Unknown on line 0
<br />
<b>Warning</b>: PHP Startup: Unable to load dynamic library 'rdkafka' (tried: C:/php-7.4.27/ext\rdkafka (鎵句笉鍒版寚瀹氱殑妯″潡銆?, C:/php-7.4.27/ext\php_rdkafka.dll (鎵句笉鍒版寚瀹氱殑妯″潡銆?) in <b>Unknown</b> on line <b>0</b><br />
4、参考：https://arnaud.le-blanc.net/php-rdkafka-doc/phpdoc/rdkafka.installation.windows.html Installing the rdkafka extension on Windows。将 librdkafka.dll 放入 PHP 根目录（与 php.exe 同一级别），将 php_rdkfaka.dll 文件放入 PHP 扩展目录（默认为“ext”）。将 librdkafka.dll 复制至：C:\php-7.4.27\librdkafka.dll。重新启动 PHP 时，不再报错。
5、查看 phpinfo，搜索：rdkafka，PHP 的 rdkafka 扩展已经启用成功。如图3
6、执行：composer install 时，不再提示，运行正常。如图4
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