Upgrade WordPress core.
Core_Upgrader::check_files
Compare the disk file checksums against the expected checksums.
Core_Upgrader::should_update_to_version
Determines if this WordPress Core version should update to an offered version or not.
Core_Upgrader::upgrade
Upgrade WordPress core.
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Core_Upgrader::upgrade_strings
Initialize the upgrade strings.
allow_major_auto_core_updates
Filters whether to enable major automatic core updates.
Core_Upgrader
Core class used for updating core.