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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 |
|---|---|
| 4446 | * @param object $post Object type containing the post information |
| 4447 | */ |
| 4448 | function _transition_post_status($new_status, $old_status, $post) { |
| 4449 | global $wpdb; |
| 4450 | |
| 4451 | if ( $old_status != 'publish' && $new_status == 'publish' ) { |
| 4452 | // Reset GUID if transitioning to publish and it is empty |
| 4453 | if ( '' == get_the_guid($post->ID) ) |
| 4454 | $wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) ); |
| 4455 | do_action('private_to_published', $post->ID); // Deprecated, use private_to_publish |
| 4456 | } |
| 4457 | |
| 4458 | // If published posts changed clear the lastpostmodified cache |
| 4459 | if ( 'publish' == $new_status || 'publish' == $old_status) { |
| 4460 | foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) { |
| 4461 | wp_cache_delete( "lastpostmodified:$timezone", 'timeinfo' ); |
| 4462 | wp_cache_delete( "lastpostdate:$timezone", 'timeinfo' ); |
| 4463 | } |
| 4464 | } |