phpMyAdmin Error: The mbstring extension is missing. Please check your PHP configuration

just run these command

sudo apt-get install phpmyadmin php-mbstring php-gettext

sudo service apache2 restart

Or you can follow this post...

Check This Post

I've solved my problem by this way: Edit the php.ini file:

1. change extension_dir = "ext" into extension_dir = "D:\php\ext" （please write ur own path）
2. change ;extension=php_mbstring.dll into extension=php_mbstring.dll （delete the ";"）
3. Then just save your php.ini file and copy it to ur Windows directory。(“C:\Windows“)
4. restart the apache server。

The above is my solution,Hope it will work for u.

If you are ubuntu 14.04 and using php 5.6 You are missing out on mbstring and mysql module

Please install mbstring and mysql by

sudo apt-get install php5.6-mbstring
sudo apt-get install php5.6-mysql

and restart apache

sudo service apache2 restart

It could happen after you update your php version, for instance if you upgrade from php5.6 to php7.1 you need to run these commands:

sudo apt-get install php7.1-mbstring
sudo service apache2 restart

If your destination version is different you need to check if the mbstring package exsit or not, an example for php7.0:

sudo apt-cache search php7.0-mbstring

I found it useful to first check existence of all modules that you working with, then performing an upgrade, in addition to that update phpmyadmin after upgrading your php is a good idea

In my case i made a new installation of php7 using xampp, the error was in php.ini at line 699, i just did

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

to

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

and it worked for me.

I checked this by running the php.exe it gave me that error and i fixed it.