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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 |
|---|---|
| 3075 | } |
| 3076 | |
| 3077 | /** This filter is documented in wp-includes/post.php */ |
| 3078 | $check = apply_filters( 'pre_trash_post', null, $post ); |
| 3079 | if ( null !== $check ) { |
| 3080 | return $check; |
| 3081 | } |
| 3082 | |
| 3083 | /** This action is documented in wp-includes/post.php */ |
| 3084 | do_action( 'wp_trash_post', $post_id ); |
| 3085 | |
| 3086 | add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status ); |
| 3087 | add_post_meta( $post_id, '_wp_trash_meta_time', time() ); |
| 3088 | |
| 3089 | $old_status = $post->post_status; |
| 3090 | $new_status = 'trash'; |
| 3091 | $wpdb->update( $wpdb->posts, array( 'post_status' => $new_status ), array( 'ID' => $post->ID ) ); |
| 3092 | clean_post_cache( $post->ID ); |
| 3093 | |