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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 |
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102 | } |
103 |
|
104 | /** |
105 | * Fires after the Multisite DB upgrade for each site is complete. |
106 | * |
107 | * @since MU (3.0.0) |
108 | * |
109 | * @param array|WP_Error $response The upgrade response array or WP_Error on failure. |
110 | */ |
111 | do_action( 'after_mu_upgrade', $response ); |
112 | /** |
113 | * Fires after each site has been upgraded. |
114 | * |
115 | * @since MU (3.0.0) |
116 | * |
117 | * @param int $site_id The Site ID. |
118 | */ |
119 | do_action( 'wpmu_upgrade_site', $site_id ); |
120 | } |