WP_REST_Autosaves_Controller::create_item() WordPress Method

	public function create_item( $request ) {

		if ( ! defined( 'DOING_AUTOSAVE' ) ) {
			define( 'DOING_AUTOSAVE', true );
		}

		$post = get_post( $request['id'] );

		if ( is_wp_error( $post ) ) {
			return $post;
		}

		$prepared_post     = $this->parent_controller->prepare_item_for_database( $request );
		$prepared_post->ID = $post->ID;
		$user_id           = get_current_user_id();

		if ( ( 'draft' === $post->post_status || 'auto-draft' === $post->post_status ) && $post->post_author == $user_id ) {
			// Draft posts for the same author: autosaving updates the post and does not create a revision.
			// Convert the post object to an array and add slashes, wp_update_post() expects escaped array.
			$autosave_id = wp_update_post( wp_slash( (array) $prepared_post ), true );
		} else {
			// Non-draft posts: create or update the post autosave.
			$autosave_id = $this->create_post_autosave( (array) $prepared_post );
		}

		if ( is_wp_error( $autosave_id ) ) {
			return $autosave_id;
		}

		$autosave = get_post( $autosave_id );
		$request->set_param( 'context', 'edit' );

		$response = $this->prepare_item_for_response( $autosave, $request );
		$response = rest_ensure_response( $response );

		return $response;
	}