You need to run this in powershell (Admin)
Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
choco upgrade chocolatey
choco install php
you can specify version
choco install php --version=7.4.1
last step is to update windows environment, to do that you need to run these codes.
Import-Module "$env:ChocolateyInstall\helpers\chocolateyProfile.psm1"
Update-SessionEnvironment
php -v
And your done! :)