[PS] better code format, vendor extension naming

[wing328]

• better code format
• vendor extension naming

cc @Ghufz

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[ybelenko]

Unfortunately PHP 7.2.15 isn't enough for latest Symfony and Laravel. Both requires ^7.2.5
https://packagist.org/packages/symfony/framework-bundle
https://packagist.org/packages/laravel/framework

UPD: Lumen requires ^7.2.5 too.

[wing328]

Then 7.2.15 should meet the requirement (15 > 5), right?

[ybelenko]

You're right. I'm confused. Maybe it was different dist in my previous PRs, not dist: xenial. Xenial environment doesn't contain preinstalled PHP versions higher than 7.2, but it's not a big deal until 30 Nov 2020.

[wing328]

👌 let's deal with it later after the image installs with a newer version of php