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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 |
|---|---|
| 1650 | $subject = __( 'New %1$s Site: %2$s' ); |
| 1651 | |
| 1652 | /** |
| 1653 | * Filters the subject of the welcome email after site activation. |
| 1654 | * |
| 1655 | * @since MU (3.0.0) |
| 1656 | * |
| 1657 | * @param string $subject Subject of the email. |
| 1658 | */ |
| 1659 | $subject = apply_filters( 'update_welcome_subject', sprintf( $subject, $current_network->site_name, wp_unslash( $title ) ) ); |
| 1660 | |
| 1661 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
| 1662 | |
| 1663 | if ( $switched_locale ) { |
| 1664 | restore_previous_locale(); |
| 1665 | } |
| 1666 | |
| 1667 | return true; |
| 1668 | } |