File: wp-admin/includes/update-core.php
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Preloads old Requests classes and interfaces.
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function_upgrade_422_remove_genericons()
Cleans up Genericons example files.
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functionupdate_core()
Upgrades the core of WordPress.
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hookupdate_feedback
Filters feedback messages displayed during the core update process.
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Fires after WordPress core has been successfully updated.
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function_redirect_to_about_wordpress()
Redirect to the About WordPress page after a successful upgrade.