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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 |
---|---|
1600 | $current_site->site_name = 'WordPress'; |
1601 |
|
1602 | /** |
1603 | * Filter the subject of the welcome email after user activation. |
1604 | * |
1605 | * @since MU |
1606 | * |
1607 | * @param string $subject Subject of the email. |
1608 | */ |
1609 | $subject = apply_filters( 'update_welcome_user_subject', sprintf( __( 'New %1$s User: %2$s' ), $current_site->site_name, $user->user_login) ); |
1610 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
1611 | return true; |
1612 | } |
1613 |
|
1614 | /** |
1615 | * Get the current site info. |
1616 | * |
1617 | * Returns an object containing the 'id', 'domain', 'path', and 'site_name' |
1618 | * properties of the site being viewed. |