Answers for "composer detected issues in your platform: your composer dependencies require the following php extensions to be installed: mysqli, openssl\"

Composer detected issues in your platform: Your Composer dependencies require the following PHP extensions to be installed: xml

sudo apt-get update
sudo apt install php-xml

Composer detected issues in your platform: Your Composer dependencies require the following PHP extensions to be installed:

sudo yum search php-THE_EXTENSION

sudo yum install THE_EXTENSION_FROM_LIST