At some point you may get this warning.
Some settings on your machine
Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:
The detect_unicode setting must be disabled.
Add the following to the end of your `php.ini`:
detect_unicode = Off
“There are a few solutions online, but the easiest I found was on Stack Overflow. The problem is that the PHP CLI doesn’t load the same php.ini by default, and unlike on most Linux installations there isn’t a seperate php-cli.ini and seemingly /etc/php.ini.default doesn’t load so much. You can pass it as a runtime parameter though:”
You basically run open Terminal and copy/paste the following command and hit Enter key.
sudo url -s getcomposer.org
| php -d detect_unicode=Off