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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 |
|---|---|
| 1366 | global $current_site; |
| 1367 | |
| 1368 | if ( !apply_filters('wpmu_welcome_user_notification', $user_id, $password, $meta) ) |
| 1369 | return false; |
| 1370 | |
| 1371 | $welcome_email = get_site_option( 'welcome_user_email' ); |
| 1372 | |
| 1373 | $user = new WP_User($user_id); |
| 1374 | |
| 1375 | $welcome_email = apply_filters( 'update_welcome_user_email', $welcome_email, $user_id, $password, $meta); |
| 1376 | $welcome_email = str_replace( 'SITE_NAME', $current_site->site_name, $welcome_email ); |
| 1377 | $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email ); |
| 1378 | $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email ); |
| 1379 | $welcome_email = str_replace( 'LOGINLINK', wp_login_url(), $welcome_email ); |
| 1380 | |
| 1381 | $admin_email = get_site_option( 'admin_email' ); |
| 1382 | |
| 1383 | if ( $admin_email == '' ) |
| 1384 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |