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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 |
---|---|
1580 | $current_site->site_name = 'WordPress'; |
1581 |
|
1582 | /** |
1583 | * Filters the subject of the welcome email after user activation. |
1584 | * |
1585 | * @since MU |
1586 | * |
1587 | * @param string $subject Subject of the email. |
1588 | */ |
1589 | $subject = apply_filters( 'update_welcome_user_subject', sprintf( __( 'New %1$s User: %2$s' ), $current_site->site_name, $user->user_login) ); |
1590 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
1591 | return true; |
1592 | } |
1593 |
|
1594 | /** |
1595 | * Get the current network. |
1596 | * |
1597 | * Returns an object containing the 'id', 'domain', 'path', and 'site_name' |
1598 | * properties of the network being viewed. |