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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 |
|---|---|
| 1489 | $current_site->site_name = 'WordPress'; |
| 1490 | |
| 1491 | /** |
| 1492 | * Filter the subject of the welcome email after site activation. |
| 1493 | * |
| 1494 | * @since MU |
| 1495 | * |
| 1496 | * @param string $subject Subject of the email. |
| 1497 | */ |
| 1498 | $subject = apply_filters( 'update_welcome_subject', sprintf( __( 'New %1$s Site: %2$s' ), $current_site->site_name, wp_unslash( $title ) ) ); |
| 1499 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 1500 | return true; |
| 1501 | } |
| 1502 | |
| 1503 | /** |
| 1504 | * Notify a user that their account activation has been successful. |
| 1505 | * |
| 1506 | * Filter 'wpmu_welcome_user_notification' to disable or bypass. |
| 1507 | * |