Ensure plugin auto updates are blocked if required PHP version is not supported

[TimothyBlynJacobs]

In #43987 and #44350 plugin updates were blocked from the UI if the PHP requirements were not met. This should be extended to prevent an auto update from skipping this check and being installed automatically.

I think doing the same requires_php checks from the UI in WP_Automatic_Updater::should_update() would work.

[afragen]

If this is the correct place for the test can we reverse the version_compare So we don’t need !.

Another advantage of having a function handle this. 😉

[davidbaumwald]

Replying to afragen:

If this is the correct place for the test can we reverse the version_compare So we don’t need !.

Another advantage of having a function handle this.

@afragen Good point. Whether or not the placement is correct, I've updated the patch for code brevity.

If it needs to be moved elsewhere, let me know.

[davidbaumwald]

Updated patch to conform to WPCS

[desrosj]

46613.4.diff​ updates the version compare to not include =. If the version returned by phpinfo() is exactly the same as the required minimum version, then the update should be allowed.

Also, I have reversed the comparison so that the local version is listed first in the comparison. This matches the two other version_compare() calls above making it a little harder to get tripped up.

[desrosj]

In 45165:

Upgrade/Install: Prevent plugin auto updates if PHP version requirements are not satisfied.

In [44937] and [44939], changes were made to prevent a user from updating any plugin that requires a higher version of PHP than the site is running. This compliments those changes to also prevent plugins from being auto updated when the same requirements are not met.

Props: TimothyBlynJacobs, davidbaumwald.
Fixes #46613.