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