Title: wp-admin/includes/update-core.php | Developer.WordPress.org

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# File: wp-admin/includes/update-core.php

 * function[_preload_old_requests_classes_and_interfaces()](https://developer.wordpress.org/reference/functions/_preload_old_requests_classes_and_interfaces/)
 * Preloads old Requests classes and interfaces.
 * Used by [1 function](https://developer.wordpress.org/reference/functions/_preload_old_requests_classes_and_interfaces/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/functions/_preload_old_requests_classes_and_interfaces/#uses)
   | Source: [wp-admin/includes/update-core.php:1634](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/update-core.php#L1634-L1669)
 * function[_upgrade_422_remove_genericons()](https://developer.wordpress.org/reference/functions/_upgrade_422_remove_genericons/)
 * Cleans up Genericons example files.
 * Used by [1 function](https://developer.wordpress.org/reference/functions/_upgrade_422_remove_genericons/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/functions/_upgrade_422_remove_genericons/#uses)
   | Source: [wp-admin/includes/update-core.php:1743](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/update-core.php#L1743-L1777)
 * function[update_core()](https://developer.wordpress.org/reference/functions/update_core/)
 * Upgrades the core of WordPress.
 * Used by [1 function](https://developer.wordpress.org/reference/functions/update_core/#used-by)
   | Uses [22 functions](https://developer.wordpress.org/reference/functions/update_core/#uses)
   | Source: [wp-admin/includes/update-core.php:1039](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/update-core.php#L1039-L1612)
 * hook[update_feedback](https://developer.wordpress.org/reference/hooks/update_feedback/)
 * Filters feedback messages displayed during the core update process.
 * Used by [2 functions](https://developer.wordpress.org/reference/hooks/update_feedback/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/hooks/update_feedback/#uses)
   | Source: [wp-admin/includes/update-core.php:1075](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/update-core.php#L1075-L1075)
 * hook[_core_updated_successfully](https://developer.wordpress.org/reference/hooks/_core_updated_successfully/)
 * Fires after WordPress core has been successfully updated.
 * Used by [1 function](https://developer.wordpress.org/reference/hooks/_core_updated_successfully/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/hooks/_core_updated_successfully/#uses)
   | Source: [wp-admin/includes/update-core.php:1604](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/update-core.php#L1604-L1604)
 * function[_redirect_to_about_wordpress()](https://developer.wordpress.org/reference/functions/_redirect_to_about_wordpress/)
 * Redirect to the About WordPress page after a successful upgrade.
 * Used by [0 functions](https://developer.wordpress.org/reference/functions/_redirect_to_about_wordpress/#used-by)
   | Uses [3 functions](https://developer.wordpress.org/reference/functions/_redirect_to_about_wordpress/#uses)
   | Source: [wp-admin/includes/update-core.php:1684](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/update-core.php#L1684-L1733)