February 12, 2011 
Definition:
function set_post_type( $post_id = 0, $post_type = 'post' ) {}
Updates the post type for the post ID.
The page or post cache will be cleaned for the post ID.
Parameters
- int $post_id: Post ID to change post type. Not actually optional.
- string $post_type: Optional, default is post. Supported values are ‘post’ or ‘page’ to name a few.
Return values
returns:Amount of rows changed. Should be 1 for success and 0 for failure.
Source code
function set_post_type( $post_id = 0, $post_type = 'post' ) {
global $wpdb;
$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
$return = $wpdb->update($wpdb->posts, array('post_type' => $post_type), array('ID' => $post_id) );
if ( 'page' == $post_type )
clean_page_cache($post_id);
else
clean_post_cache($post_id);
return $return;
}
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