Besides enjoying some greenfield work, we often have to work on legacy projects at Spatie too. Sometimes those projects don't run on the latest PHP version. I this blogpost I'd like to show you a way to switch PHP version easily when using Laravel Valet. (I know you could also use Docker or Virtualbox to solve this problem, but that's out of scope for this blogpost.)
I'm going to assume that you already use the latest versions of homebrew, Laravel Valet and have PHP 7.2 installed. In order to easily switch PHP versions you first should install the older versions of PHP.
Run these commands in your terminal
brew install email@example.com
brew install firstname.lastname@example.org
Next were are going to define a bash function and some aliases to easily switch the current PHP version. If you don't know how to create a bash function and where to put this code, read this blogpost first.
brew unlink email@example.com firstname.lastname@example.org email@example.com
brew link --force --overwrite $1
brew services start $1
composer global update
rm -f ~/.config/valet/valet.sock
alias php70="phpv firstname.lastname@example.org"
alias php71="phpv email@example.com"
alias php72="phpv php"
With this out of the way, you can easily switch to PHP 7.0 by executing
php70 in your terminal. You can switch back to 7.2 by performing
php72. The first time you switch to a particular PHP version might take a while. Subsequent switches will go much faster.
Credits for this
phpv function go to my colleagues Seb and Willem. They created it based on this excellent blogpost on how to use multiple PHP versions in Mojave.