Whenever I try to enter my phpMyAdmin, it gives me this error:
The mbstring extension is missing. Please check your PHP configuration.
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In newer versions of PHP, "extension_dir" is not initially enabled.
Ubuntu 15.10
1) sudo nano /etc/php/7.0/apache2/php.ini
uncommited extension=php_mbstring.dll
2) sudo apt-get install php7.0-mbstring
3) restart apache2
I had this problem in the past with MAMP on a Windows machine.
Open MAMP start page and go to your current configuration of PHP (phpinfo). Check the Configuration File (php.ini) PATH.
Mine was set to C:\Windows, where of course I had no PHP.ini file.
Either change the php.ini path to C:\MAMP\conf\php5.6.8 (or your php version conf path) or just copy php.ini to c:\windows.
In Centos I have installed a php extension. I did this with:
yum install php-mbstring
after installing WAMP 3 with Apache 2.4.17 and php5.6.17 I tried to look at php.ini from wampserver (green icon in tray). It wasn't finding it. I copied php.ini from the php.5.6.15 directory to the apache2.4.17\bin\ directory and phpmyadmin worked fine without missing mbstring
In php's directory try change extension of configuration file (php.ini-development - default value of this file). I changed it to php.ini and phpmyadmin has worked.