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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 |
|---|---|
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Fires after the Multisite DB upgrade for each site is complete. |
| 105 | * |
| 106 | * @since MU (3.0.0) |
| 107 | * |
| 108 | * @param array|WP_Error $response The upgrade response array or WP_Error on failure. |
| 109 | */ |
| 110 | do_action( 'after_mu_upgrade', $response ); |
| 111 | /** |
| 112 | * Fires after each site has been upgraded. |
| 113 | * |
| 114 | * @since MU (3.0.0) |
| 115 | * |
| 116 | * @param int $site_id The Site ID. |
| 117 | */ |
| 118 | do_action( 'wpmu_upgrade_site', $site_id ); |
| 119 | } |