PHP Warning: ‘vcruntime140.dll’ 14.0 is not compatible with this PHP build linked with 14.16 in Unknown on line 0
php7.4的安装和配置跟之前没有分别，唯一要注意的一点是它的编译已经从vc++15 变成了vc++16，它的安装包命名也变成了vs16（visualstudio 16，即vs 2019）
直接下载个全的：
Visual Studio 2015、2017 和 2019
https://support.microsoft.com/zh-cn/help/2977003/the-latest-supported-visual-c-downloads
其他工具、框架和可再发行组件
下载 “Microsoft Visual C++ Redistributable for Visual Studio xxx”
下载之后安装，然后重启电脑，就可以了。
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