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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 |
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1462 |
|
1463 | /** |
1464 | * Filter the comment notification email headers. |
1465 | * |
1466 | * @since 1.5.2 |
1467 | * |
1468 | * @param string $message_headers Headers for the comment notification email. |
1469 | * @param int $comment_id Comment ID. |
1470 | */ |
1471 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment_id ); |
1472 |
|
1473 | foreach ( $emails as $email ) { |
1474 | @wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); |
1475 | } |
1476 |
|
1477 | return true; |
1478 | } |
1479 | endif; |
1480 |
|