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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 | 
|---|---|
| 2563 |      $post_name = wp_unique_post_slug($post_name, $post_ID, $post_status, $post_type, $post_parent); | 
| 2564 |  | 
| 2565 |      // expected_slashed (everything!) | 
| 2566 |      $data = compact( array( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'guid' ) ); | 
| 2567 |      $data = apply_filters('wp_insert_post_data', $data, $postarr); | 
| 2568 |      $data = stripslashes_deep( $data ); | 
| 2569 |      $where = array( 'ID' => $post_ID ); | 
| 2570 |  | 
| 2571 |      if ( $update ) { | 
| 2572 |           do_action( 'pre_post_update', $post_ID ); | 
| 2573 |           if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { | 
| 2574 |                if ( $wp_error ) | 
| 2575 |                     return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error); | 
| 2576 |                else | 
| 2577 |                     return 0; | 
| 2578 |           } | 
| 2579 |      } else { | 
| 2580 |           if ( isset($post_mime_type) ) | 
| 2581 |                $data['post_mime_type'] = stripslashes( $post_mime_type ); // This isn't in the update |