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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 |
---|---|
1678 | $subject = __( 'New %1$s Site: %2$s' ); |
1679 |
|
1680 | /** |
1681 | * Filters the subject of the welcome email after site activation. |
1682 | * |
1683 | * @since MU (3.0.0) |
1684 | * |
1685 | * @param string $subject Subject of the email. |
1686 | */ |
1687 | $subject = apply_filters( 'update_welcome_subject', sprintf( $subject, $current_network->site_name, wp_unslash( $title ) ) ); |
1688 |
|
1689 | wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers ); |
1690 |
|
1691 | if ( $switched_locale ) { |
1692 | restore_previous_locale(); |
1693 | } |
1694 |
|
1695 | return true; |
1696 | } |