d8: Better (stand-alone?) PHP requirement checking

Problem/Motivation

Drupal 8 has a lot of PHP requirements → , such as several extensions. \core\modules\system\system.install seems to check for some of these, but not all, and seems to miss several other requirements. See the long Shortlist → .

For example, I think I have cURL, but not the libSSH Version, which seems to be required for install update. I think I have PDO, but the shortlist says I shouldn't have the PECL version. The Shortlist has over 35 entries to check.

Proposed resolution

It would nice to extend the requirement checking to be as thorough as possible. Better yet, to have a small stand-alone program to check a server, before trying to install 15,000 files in Drupal 8.

This would make it easier for those of us who aren't experts at server configuration and installations, and save a lot of time having to check 35+ requirements.