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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 |
|---|---|
| 3429 | if ( ! comments_open( $comment_post_ID ) ) { |
| 3430 | |
| 3431 | /** |
| 3432 | * Fires when a comment is attempted on a post that has comments closed. |
| 3433 | * |
| 3434 | * @since 1.5.0 |
| 3435 | * |
| 3436 | * @param int $comment_post_ID Post ID. |
| 3437 | */ |
| 3438 | do_action( 'comment_closed', $comment_post_ID ); |
| 3439 | |
| 3440 | return new WP_Error( 'comment_closed', __( 'Sorry, comments are closed for this item.' ), 403 ); |
| 3441 | |
| 3442 | } elseif ( 'trash' === $status ) { |
| 3443 | |
| 3444 | /** |
| 3445 | * Fires when a comment is attempted on a trashed post. |
| 3446 | * |
| 3447 | * @since 2.9.0 |