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admin_action_{$action}

Fires when an ‘action’ request variable is sent.

load-{$pagenow}

Fires before a particular screen is loaded.

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load-{$plugin_page}

Fires before a particular screen is loaded.

{$page_hook}

Used to call the registered callback for a plugin screen.

load-{$page_hook}

Fires before a particular screen is loaded.

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admin_init

Fires as an admin screen or script is being initialized.

do_mu_upgrade

Filters whether to attempt to perform the multisite DB upgrade routine.

after_db_upgrade

Fires on the next page load after a successful DB upgrade.