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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 |
|---|---|
| 3536 | if ( ! comments_open( $comment_post_id ) ) { |
| 3537 | |
| 3538 | /** |
| 3539 | * Fires when a comment is attempted on a post that has comments closed. |
| 3540 | * |
| 3541 | * @since 1.5.0 |
| 3542 | * |
| 3543 | * @param int $comment_post_id Post ID. |
| 3544 | */ |
| 3545 | do_action( 'comment_closed', $comment_post_id ); |
| 3546 | |
| 3547 | return new WP_Error( 'comment_closed', __( 'Sorry, comments are closed for this item.' ), 403 ); |
| 3548 | |
| 3549 | } elseif ( 'trash' === $status ) { |
| 3550 | |
| 3551 | /** |
| 3552 | * Fires when a comment is attempted on a trashed post. |
| 3553 | * |
| 3554 | * @since 2.9.0 |