Dependency issue trying to install php-mbstring on ec2

Question

I am trying to install yii2 on my Amazon Linux AMI instance, it requires the php-mbstring extension to work.

When I tried to run sudo y

Answer 1

It seems you have php 5.6 installed.
You need to install mbstring for that particular version of php.

Run sudo yum install php56-mbstring

After that it might be a good idea to restart apache (thanks! @hexicle),
using sudo service httpd restart

Answer 2

Amazon Linux AMI release 2017.09

sudo yum install php70-mysqlnd
sudo service httpd restart