Cannot validate since a PHP installation could not be found. Use the setting 'php.validate.executablePath' to configure the PHP executable. mac
// For Mac, I had php installed. I just needed to link the version I
// wanted to use
$ brew link [email protected]
// Then I added this line to my settings.json in vscode
"php.validate.executablePath": "/usr/local/opt/[email protected]/bin",