Invoke GrumPHP executable using the PHP binary so it respects the PHP version Composer was invoked with.

[echernyavskiy]

Q	A
Branch	invoke-grumphp-using-php-binary
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Documented?	no
Fixed tickets	-

Fixes #1170

[veewee]

@echernyavskiy Thanks for the PR.
This doesn't seem to be working on windows. Can you take a look at the failing appveyor tasks?

[echernyavskiy]

@veewee, the 8.4 failures there look like they have to do with the environment:

php --version
php : PHP Warning:  'C:\windows\SYSTEM32\VCRUNTIME140.dll' 14.22 is not compatible with this PHP build linked with 14.43 in Unknown on line 0

For other PHP versions it looks like GrumPHP's pre-commit file is not getting created for some reason. I'm not sure how to investigate this - if someone running Windows is able to look into it, that'd be great.

[veewee]

I don't own a Windows computer either. But can't merge this the way it is, since it breaks every windows installation :)
Previously, i've used appveyor to debug this kind of stuff directly from within the E2E tests and rerun. It's slow and tyring, but it gets the job done.