#Install php version 7.3
brew install php@7.3
#Install the required PHP to your PATH
echo 'export PATH="/usr/local/opt/php@7.3/bin:$PATH"' >> ~/.bash_profile
echo 'export PATH="/usr/local/opt/php@7.3/sbin:$PATH"' >> ~/.bash_profile
source ~/.bash_profile
#Check Version
php --version
#Show you where your ini file is loaded
php --ini
$ brew unlink php@7.1
$ brew link php@7.4 --force --overwrite