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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 |
|---|---|
| 23 | |
| 24 | if ( empty( $post->comment_status ) ) { |
| 25 | /** |
| 26 | * Fires when a comment is attempted on a post that does not exist. |
| 27 | * |
| 28 | * @since 1.5.0 |
| 29 | * |
| 30 | * @param int $comment_post_ID Post ID. |
| 31 | */ |
| 32 | do_action( 'comment_id_not_found', $comment_post_ID ); |
| 33 | exit; |
| 34 | } |
| 35 | |
| 36 | // get_post_status() will get the parent status for attachments. |
| 37 | $status = get_post_status($post); |
| 38 | |
| 39 | $status_obj = get_post_status_object($status); |
| 40 | |
| 41 | if ( ! comments_open( $comment_post_ID ) ) { |