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core_upgrade_preamble › WordPress动作钩子
Since2.9.0
已弃用n/a
› do_action( 'core_upgrade_preamble' )
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Fires after the core, plugin, and theme update tables.
Related Functions: core_upgrade_preamble, do_core_upgrade, core_update_footer, _upgrade_cron_array, wp_should_upgrade_global_tables, find_core_update