[php] PHP Fatal error when trying to access phpmyadmin mb_detect_encoding

First error is caused by php because the extension mbstring is either not installed or not active.

The second error is output of phpMyAdmin/your site asking you to install / enable the mysqli extension.

To enable mbstring and mysqli edit your php.ini and add/uncomment the two lines with mbstring.so and mysqli.so on unix or mbstring.dll and mysqli.dll on windows

Unix /etc/(phpX/)php.ini

extension=mysqli.so
extension=mbstring.so

Windows PHP installation folder\etc\php.ini

extension=mysqli.dll
extension=mbstring.dll

Don't forget to restart your webserver after this.

EDIT: User added he was using redhat in the comments so here's how you install extensions on all CentOS/Fedora/RedHat/Yum based linux distros

sudo yum install php-mysqli
sudo yum install php-mbstring

restart your werbserver
sudo /etc/init.d/httpd restart

you can verify your installation with a little php script in your document root. This lists all settings, versions and active extensions you've installed for php

test.php

<?php
phpinfo();

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