Brew::installed() fails to correctly parse installed version of PHP if "php" is installed with no version constraint

[mattstauffer]

See notes here:

#728 (comment)

To reproduce:

Install php instead of php@7.3 with Homebrew, then run valet use php73. Valet will suggest it's not installed, even though it is, because it looks at php which doesn't have a version number and therefore doesn't match php73.

[mattstauffer]

Thanks to @lasseeee and @drbyte for finding, testing, and refining the issue.

[workzentre]

Same here, If I run valet use php@7.2 still stuck with 5.6.3 "alias" php (plain, no version). Thanks.