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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 |
|---|---|
| 1384 | $admin_email = 'support@' . $_SERVER['SERVER_NAME']; |
| 1385 | |
| 1386 | $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) ); |
| 1387 | $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 1388 | $message = $welcome_email; |
| 1389 | |
| 1390 | if ( empty( $current_site->site_name ) ) |
| 1391 | $current_site->site_name = 'WordPress MU'; |
| 1392 | |
| 1393 | $subject = apply_filters( 'update_welcome_user_subject', sprintf(__('New %1$s User: %2$s'), $current_site->site_name, $user->user_login) ); |
| 1394 | wp_mail($user->user_email, $subject, $message, $message_headers); |
| 1395 | return true; |
| 1396 | } |
| 1397 | |
| 1398 | /** |
| 1399 | * Get the current site info. |
| 1400 | * |
| 1401 | * Returns an object containing the ID, domain, path, and site_name |
| 1402 | * of the site being viewed. |