Registers a post type.

Registers a directory that contains themes.

Outputs rel=canonical for singular queries.

Checks a theme’s support for a given feature before loading the functions which implement it.

Sanitizes a string from user input or from the database.

Searches all registered theme directories for complete and valid themes.

Registers an image size for the post thumbnail.

Sets/updates the value of a site transient.

Don’t auto-p wrap shortcodes that stand alone.

Streams image in post to browser, along with enqueued changes in $_REQUEST['history'].