今天突然发现web页面不能解析了，直接返回PHP代码了，想起来可能是由于不小心更新过apt 源，有一次安装了PHP8，后来又卸载，导致的，查了一下，发现是libapache2-mod-PHP没安装。
我就 sudo apt-get install libapache2-mod-PHP 直接执行安装了，结果发现又把PHP8安装上来了，大意了，现在源最新的PHP是8，然后又 sudo apt remove PHP8 系列相关，然后重新search
$ sudo apt search libapache2-mod-PHP7.4 Sorting... Done Full Text Search... Done libapache2-mod-PHP7.4/focal,Now 7.4.23-1+ubuntu20.04.1+deb.sury.org+1 amd64 [residual-config] server-side, HTML-embedded scripting language (Apache 2 module) PHP7.4-fpm/focal,Now 7.4.23-1+ubuntu20.04.1+deb.sury.org+1 amd64 [installed] server-side, HTML-embedded scripting language (FPM-CGI binary)
然后就 sudo apt-get install libapache2-mod-PHP7.4 跑一下
$ sudo apt-get install libapache2-mod-PHP7.4 Reading package lists... Done Building dependency tree Reading state @R_807_4045@ion... Done The following NEW packages will be installed: libapache2-mod-PHP7.4 0 upgraded, 1 newly installed, 0 to remove and 17 not upgraded. Need to get 0 B/1,371 kB of archives. After this operation, 4,680 kB of additional disk space will be used. Selecting prevIoUsly unselected package libapache2-mod-PHP7.4. (Reading database ... 241958 files and directories currently installed.) Preparing to unpack .../libapache2-mod-PHP7.4_7.4.23-1+ubuntu20.04.1+deb.sury.org+1_amd64.deb ... Unpacking libapache2-mod-PHP7.4 (7.4.23-1+ubuntu20.04.1+deb.sury.org+1) ... Setting up libapache2-mod-PHP7.4 (7.4.23-1+ubuntu20.04.1+deb.sury.org+1) ... apache2_invoke: Enable module PHP7.4 Processing triggers for libapache2-mod-PHP7.4 (7.4.23-1+ubuntu20.04.1+deb.sury.org+1) ...
执行完毕重启apache，好了，代码按7.4解析了
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