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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 |
|---|---|
| 9 | |
| 10 | require_once( './admin.php' ); |
| 11 | |
| 12 | if ( ! is_multisite() ) |
| 13 | wp_die( __( 'Multisite support is not enabled.' ) ); |
| 14 | |
| 15 | if ( empty( $_GET['action'] ) ) |
| 16 | wp_redirect( admin_url( 'ms-admin.php' ) ); |
| 17 | |
| 18 | do_action( 'wpmuadminedit' , ''); |
| 19 | |
| 20 | if ( isset( $_GET['id' ]) ) |
| 21 | $id = intval( $_GET['id'] ); |
| 22 | elseif ( isset( $_POST['id'] ) ) |
| 23 | $id = intval( $_POST['id'] ); |
| 24 | |
| 25 | switch ( $_GET['action'] ) { |
| 26 | case 'siteoptions': |
| 27 | check_admin_referer( 'siteoptions' ); |