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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 |
|---|---|
| 38 | $status_obj = get_post_status_object($status); |
| 39 | |
| 40 | if ( ! comments_open( $comment_post_ID ) ) { |
| 41 | /** |
| 42 | * Fires when a comment is attempted on a post that has comments closed. |
| 43 | * |
| 44 | * @since unknown |
| 45 | * @param int $comment_post_ID Post ID. |
| 46 | */ |
| 47 | do_action( 'comment_closed', $comment_post_ID ); |
| 48 | wp_die( __('Sorry, comments are closed for this item.') ); |
| 49 | } elseif ( 'trash' == $status ) { |
| 50 | /** |
| 51 | * Fires when a comment is attempted on a trashed post. |
| 52 | * |
| 53 | * @since 2.9.0 |
| 54 | * @param int $comment_post_ID Post ID. |
| 55 | */ |
| 56 | do_action( 'comment_on_trash', $comment_post_ID ); |