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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 |
|---|---|
| 3022 | if ( ! EMPTY_TRASH_DAYS ) { |
| 3023 | return wp_delete_post( $post_id, true ); |
| 3024 | } |
| 3025 | |
| 3026 | if ( 'trash' === get_post_status( $post ) ) { |
| 3027 | return false; |
| 3028 | } |
| 3029 | |
| 3030 | /** This filter is documented in wp-includes/post.php */ |
| 3031 | $check = apply_filters( 'pre_trash_post', null, $post ); |
| 3032 | if ( null !== $check ) { |
| 3033 | return $check; |
| 3034 | } |
| 3035 | |
| 3036 | /** This action is documented in wp-includes/post.php */ |
| 3037 | do_action( 'wp_trash_post', $post_id ); |
| 3038 | |
| 3039 | add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status ); |
| 3040 | add_post_meta( $post_id, '_wp_trash_meta_time', time() ); |