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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 |
|---|---|
| 1567 | $current_site->site_name = 'WordPress'; |
| 1568 | |
| 1569 | /** |
| 1570 | * Filter the subject of the welcome email after user activation. |
| 1571 | * |
| 1572 | * @since MU |
| 1573 | * |
| 1574 | * @param string $subject Subject of the email. |
| 1575 | */ |
| 1576 | $subject = apply_filters( 'update_welcome_user_subject', sprintf( __( 'New %1$s User: %2$s' ), $current_site->site_name, $user->user_login) ); |
| 1577 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 1578 | return true; |
| 1579 | } |
| 1580 | |
| 1581 | /** |
| 1582 | * Get the current site info. |
| 1583 | * |
| 1584 | * Returns an object containing the 'id', 'domain', 'path', and 'site_name' |
| 1585 | * properties of the site being viewed. |