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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' ); |