How to Switch PHP Version in Laravel Valet between PHP 7.1 and PHP 5.6

ValetSwitchPHP.md

How to Switch PHP Version in Laravel Valet between PHP 7.1 and PHP 5.6

Valet switch PHP version with these commands

Install PHP 5.6 and switch Valet to PHP 5.6

valet stop
brew unlink php71
brew install php56
brew install php56-mcrypt
brew link php56
valet start

Then to switch back to PHP 7.1 it is as simple as:

valet stop
brew unlink php56
brew link php71
valet start

Then to switch to PHP 5.6:

valet stop
brew unlink php71
brew link php56
valet start

Had the same thing, had to remove the global composer.lock file and vendor directory, and then re-required it.

$ rm -rf ~/.composer/composer.lock ~/.composer/vendor
$ composer global req laravel/valet

It works for me: https://gist.github.com/altynbek07/2147e48ea1df9145a803c8245f5dc130

on Ubuntu or linux, put this in your .profile

#switch php version
switch-php() {
    valet stop
    sudo update-alternatives --set php /usr/bin/php$1
    rm -f ~/.valet/valet.sock
    valet install
}

then use it as switch-php 7.1 or switch-php 7.4

One liner here, simply type this in your terminal

valet use php@7.2

One liner here, simply type this in your terminal

valet use php@7.2

Aweeesome! Thank you for sharing it! 🚀

you can use phpmon

brew tap nicoverbruggen/homebrew-cask
brew install --cask phpmon

I had to do
valet use php@7.4 --force
without it, it only changed the cli, and phpinfo in the browser showed 8.0