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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 |
|---|---|
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Fires after the Multisite DB upgrade for each site is complete. |
| 88 | * |
| 89 | * @since MU |
| 90 | * |
| 91 | * @param array|WP_Error $response The upgrade response array or WP_Error on failure. |
| 92 | */ |
| 93 | do_action( 'after_mu_upgrade', $response ); |
| 94 | /** |
| 95 | * Fires after each site has been upgraded. |
| 96 | * |
| 97 | * @since MU |
| 98 | * |
| 99 | * @param int $blog_id The Site ID. |
| 100 | */ |
| 101 | do_action( 'wpmu_upgrade_site', $details[ 'blog_id' ] ); |
| 102 | } |