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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 |
|---|---|
| 3405 | if ( empty( $post->comment_status ) ) { |
| 3406 | |
| 3407 | /** |
| 3408 | * Fires when a comment is attempted on a post that does not exist. |
| 3409 | * |
| 3410 | * @since 1.5.0 |
| 3411 | * |
| 3412 | * @param int $comment_post_ID Post ID. |
| 3413 | */ |
| 3414 | do_action( 'comment_id_not_found', $comment_post_ID ); |
| 3415 | |
| 3416 | return new WP_Error( 'comment_id_not_found' ); |
| 3417 | |
| 3418 | } |
| 3419 | |
| 3420 | // get_post_status() will get the parent status for attachments. |
| 3421 | $status = get_post_status( $post ); |
| 3422 | |
| 3423 | if ( ( 'private' === $status ) && ! current_user_can( 'read_post', $comment_post_ID ) ) { |