make windows 10 recognize php 7

I tried to install PHP 7 without any local server but the windows doesn't recognize PHP 7
I downloaded PHP 7 in my local folder C:\php,
If I open a command prompt and type

cd C:\php
php -v

The output of the command shows me

PHP 7.1.9

Then I added in the Environment Variables Path C:\php.
Now if I open a new command prompt and type

php -v

The output is still

PHP 5.6.25

where I would expect PHP 7.1.9.

I need the version to be php 7 for using Laravel 5.5.

What can I do to fix this?

via Chebli Mohamed