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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 710 | |
| 711 | /** |
| 712 | * Fires after a site is fully upgraded. |
| 713 | * |
| 714 | * @since 3.9.0 |
| 715 | * |
| 716 | * @param int $wp_db_version The new $wp_db_version. |
| 717 | * @param int $wp_current_db_version The old (current) $wp_db_version. |
| 718 | */ |
| 719 | do_action( 'wp_upgrade', $wp_db_version, $wp_current_db_version ); |
| 720 | } |
| 721 | endif; |
| 722 | |
| 723 | /** |
| 724 | * Functions to be called in installation and upgrade scripts. |
| 725 | * |
| 726 | * Contains conditional checks to determine which upgrade scripts to run, |
| 727 | * based on database version and WP version being updated-to. |
| 728 | * |