升级到 Ubuntu 20.04 后 PHP MySQLi 不再工作 [重复]答案

【问题标题】：PHP MySQLi not working anymore after upgrade to Ubuntu 20.04 [duplicate]升级到 Ubuntu 20.04 后 PHP MySQLi 不再工作 [重复]
【发布时间】：2020-09-14 22:12:20
【问题描述】：

我确实安装了php7.4-mysql，错误在下面，其余在标题中

PHP 致命错误：未捕获的错误：在 {long_path}/index.php:9\n 堆栈跟踪中找不到类 'mysqli'：\n#0 {main}\n 在 {long_path}/index.php 中抛出在线9

是否有解决方案，或者我必须重新安装并重新配置所有内容（这意味着我将通过备份再次降级到 Ubuntu 18.04）？

【问题讨论】：

认为 Ubuntu 20.04 默认为 PHP 7.4 - wiki.ubuntu.com/FocalFossa/ReleaseNotes#PHP_7.4。如果有新的 php 基目录，您可能需要检查是否有任何 .ini 设置。
安装缺少的 mysqli 扩展
@MarcinOrlowski 这是一个非常无用的评论，我在第一句话中确实提到我安装了该扩展程序。
升级到 php7.4 对我有用

标签： php mysql mysqli ubuntu-18.04

【解决方案1】：

将 php 升级到 7.4 对我有用。

sudo apt-get install php7.4

【讨论】：

【解决方案2】：

我今天更新后遇到了同样的问题。我发现有些东西搞砸了，所以我试图删除它

apt remove php-mysqli
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'php7.4-mysql' instead of 'php-mysqli'
0 upgraded, 0 newly installed, 0 to remove and 19 not upgraded.

然后我尝试了清除，并安装了完全相同的结果。

最后，apt-get dist-upgrade 解决了我的问题。

您可以看到升级后我的系统处于一种未完全清除的奇怪状态。

apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  apt-show-versions libapt-pkg-perl libauthen-pam-perl libimagequant0 libio-pty-perl libnet-ssleay-perl libpython-all-dev libpython2-dev
  libpython2.7-dev libwebpdemux2 perl-openssl-defaults python-all python-all-dev python-automat python-certifi python-configparser python-constantly
  python-crypto python-dbus python-entrypoints python-gi python-hyperlink python-keyring python-olefile python-pil python-xdg python2-dev python2.7-dev
  python3-scour scour
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
  libapache2-mod-php7.2 libapache2-mod-php7.3 libpcre2-posix0 libpython-dev libpython-stdlib minecraft-overviewer php7.2 php7.3 python python-click
  python-colorama python-configobj python-dev python-incremental python-keyrings.alt python-minimal python-pip python-requests python-scour
  python-secretstorage python-serial python-twisted-bin python-twisted-core python-urllib3 python-wheel webmin
The following NEW packages will be installed:
  libapache2-mod-php7.4 libpcre2-posix2 php7.4
The following packages have been kept back:
  libomp-dev
The following packages will be upgraded:
  libapache2-mod-php libpcre2-16-0 libpcre2-32-0 libpcre2-8-0 libpcre2-dev libpython-all-dev libpython2-dev libpython2-stdlib php python-all
  python-all-dev python-pip-whl python2 python2-dev python2-minimal python3-pip
16 upgraded, 3 newly installed, 26 to remove and 1 not upgraded.
Need to get 2,675 kB/4,704 kB of archives.
After this operation, 196 MB disk space will be freed.
Do you want to continue? [Y/n] y

之后我刷新了我的页面，它又可以工作了。

希望这会有所帮助，您并不孤单。

【讨论】：