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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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1544 |
|
1545 | /** |
1546 | * Filter the comment notification email headers. |
1547 | * |
1548 | * @since 1.5.2 |
1549 | * |
1550 | * @param string $message_headers Headers for the comment notification email. |
1551 | * @param int $comment_id Comment ID. |
1552 | */ |
1553 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID ); |
1554 |
|
1555 | foreach ( $emails as $email ) { |
1556 | @wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); |
1557 | } |
1558 |
|
1559 | return true; |
1560 | } |
1561 | endif; |
1562 |
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