The mysqli extension is missing. Please check your PHP configuration

sudo apt-get install php7.2-mysql

extension=mysqli.ví (add this php.ini file)

sudo service apache2 restart

Please use above commands to tướng resolve mysqli-extension missing error

Simply specify the directory in which the loadable extensions (modules) reside in the php.ini tệp tin from

; On windows:
extension_dir="C:\xampp\php\ext"

to

; On windows:
;extension_dir = "ext"

Then enable the extension if it was disabled by changing

;extension=mysqli

to

extension=mysqli

This article can help you Configuring PHP with MySQL for Apache 2 or IIS in Windows. Look at the section "Configure PHP and MySQL under Apache 2", point 3:

extension_dir = "c:\php\extensions"      ; FOR PHP 4 ONLY 
extension_dir = "c:\php\ext"             ; FOR PHP 5 ONLY

You must uncomment extension_dir param line and mix it to tướng absolute path to tướng the PHP extensions directory.

I've been searching for hours and no one could help mạ. I did a simple thing to tướng solve this problem. (WINDOWS 10 x64)

Follow this:

1 - Go to tướng your php_mysqli.dll path (in my case: C:/xampp/php/ext);

2 - Move the php_mysqli.dll to tướng the previous thư mục (C:/xampp/php);

3 - Open php.ini and tìm kiếm the line: "extension: php_mysqli.dll";

4 - Change to tướng the path where is your file: extension="C:\xampp\php\php_mysqli.dll";

5 - Restart your application (wampp, xampp, etc.) and start Apache Server;

The problem was the path ext/php_mysqli.dll, I've tried changing the line to tướng extension="C:\xampp\php\ext\php_mysqli.dll" but doesn't worked.

I had the same problem and I solved it. You can solve it too if you follow these steps:

1. you have to tướng install PHP to tướng C:/php or your current version locate it to tướng this path and specify it as a system variable

2. then open xampp program and click config and open php.ini and uncomment the following lines:

   extension=pdo_mysql
   extension=pdo_mysql
   extension=openssl
   

try to tướng change PHP version

$sudo update-alternatives --config php

if it didn't work change for example from PHP 5.6 => PHP 7.1

    $ sudo a2dismod php5.6
    $ sudo a2enmod php7.1  
    $ sudo service apache2 restart

I encountered this problem today and eventually I realize it was the comment on the line before the mysql dll's that was causing the problem.

This is what you should have in php.ini by mặc định for PHP 5.5.16:

;extension=php_exif.dll       Must be after mbstring as it depends on it
;extension=php_mysql.dll
;extension=php_mysqli.dll

Besides removing the semi-colons, you also need to tướng delete the line of comment that came after php_exif.dll. This leaves you with

extension=php_exif.dll      
extension=php_mysql.dll
extension=php_mysqli.dll

This solves the problem in my case.

Its an issue of extension directory. You need to tướng change php extension directory manually to tướng work this.

If you are using AMPP Server, vì thế the following

Goto settings -> PHP -> Configuration

in php7.3.ini Find, (Versions might change)

extension_dir = "" , (Already having some path)

and change value to tướng

extension_dir = "C:\Program Files\Ampps\php-7.3\ext"

If you are using XAMP

Goto XAMP Settings, Apache -> PHP.ini

Find, extension_dir = in php.ini, and mix path of the php extension thư mục of your local machine. See the below example.

extension_dir = "C:\php\ext" (Check your path properly)

In my case, I had a similar issue after full installation of Debian 10.

Commandline: php -v show I am using php7.4 but print phpinfo() gives mạ php7.3

Solution: Disable php7.3 Enable php7.4

   $ a2dismod php7.3
    
   $ a2enmod php7.4
    
   $ update-alternatives --set php /usr/bin/php7.4
   $ update-alternatives --set phar /usr/bin/phar7.4
   $ update-alternatives --set phar.phar /usr/bin/phar.phar7.4
   $ update-alternatives --set phpize /usr/bin/phpize7.4
   $ update-alternatives --set php-config /usr/bin/php-config7.4

Replace

include_path=C:\Program Files (x86)\xampp\php\PEAR

with following

include_path="C:\Program Files (x86)\xampp\php\PEAR"

i.e Add commas , i checked apache error logs it was showing syntax error ví checked whole tệp tin for syntax errors.

for linux users

For mạ it was a weird behavior: i went to tướng phpmyadmin directory (for mạ /usr/share/phpmyadmin) and inside index.php tệp tin entered phpinfo();, then refreshed phpmyadmin trang web page;

surprisingly phpmyadmin was using different php version than thở what mix on system. sự kiện update-alternatives --config php doesn't change situation;

so i just disabled all other php version using directly a2dismod php8.1 (and whatever version you have) command and then enabled a version via a2enmod command.

hope help someone;