Previously, bulk upgrades did not verify that a plugin package was compatible with the site's WordPress version or the server's PHP version. This could lead to incompatible updates being installed, causing various compatibility issues and errors.
This change implements the following checks:
- If available, the API response's `requires` and `requires_php` values are checked for compatibility. This saves time, diskspace, memory and file operations by failing the upgrade before the package is downloaded and unpacked.
- If the API check passes, the downloaded and unpacked package is verified using `Plugin_Upgrader::check_package()` to ensure a plugin file is present, and the plugin's "RequiresWP" and "RequiresPHP" headers are compatible, if present. This ensures that a mismatch between the API response and the plugin file's headers does not cause an incompatible plugin to be installed.
Props salcode, afragen, mukesh27, iammehedi1, zunaid321, johnbillion, SergeyBiryukov, costdev.
Fixes#59198.
git-svn-id: https://develop.svn.wordpress.org/trunk@56525 602fd350-edb4-49c9-b593-d223f7449a82
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