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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 |
|---|---|
| 124 | $value = wp_unslash( $_POST[ $option_name ] ); |
| 125 | update_site_option( $option_name, $value ); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Fires after the network options are updated. |
| 130 | * |
| 131 | * @since MU (3.0.0) |
| 132 | */ |
| 133 | do_action( 'update_wpmu_options' ); |
| 134 | |
| 135 | wp_redirect( add_query_arg( 'updated', 'true', network_admin_url( 'settings.php' ) ) ); |
| 136 | exit; |
| 137 | } |
| 138 | |
| 139 | require_once ABSPATH . 'wp-admin/admin-header.php'; |
| 140 | |
| 141 | if ( isset( $_GET['updated'] ) ) { |
| 142 | ?><div id="message" class="updated notice is-dismissible"><p><?php _e( 'Settings saved.' ); ?></p></div> |