lt set by a specific number of items.' ),
			'type'        => 'integer',
		);

		$query_params['order'] = array(
			'description' => __( 'Order sort attribute ascending or descending.' ),
			'type'        => 'string',
			'default'     => 'desc',
			'enum'        => array( 'asc', 'desc' ),
		);

		$query_params['orderby'] = array(
			'description' => __( 'Sort collection by object attribute.' ),
			'type'        => 'string',
			'default'     => 'date',
			'enum'        => array(
				'date',
				'id',
				'include',
				'relevance',
				'slug',
				'include_slugs',
				'title',
			),
		);

		return $query_params;
	}

	/**
	 * Checks the post excerpt and prepare it for single post output.
	 *
	 * @since 4.7.0
	 *
	 * @param string  $excerpt The post excerpt.
	 * @param WP_Post $post    Post revision object.
	 * @return string Prepared excerpt or empty string.
	 */
	protected function prepare_excerpt_response( $excerpt, $post ) {

		/** This filter is documented in wp-includes/post-template.php */
		$excerpt = apply_filters( 'the_excerpt', $excerpt, $post );

		if ( empty( $excerpt ) ) {
			return '';
		}

		return $excerpt;
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_REST_Revisions_Controller' not found in /home/besengumus/public_html/wp-includes/rest-api/endpoints/class-wp-rest-template-revisions-controller.php:17
Stack trace:
#0 /home/besengumus/public_html/wp-settings.php(289): require()
#1 /home/besengumus/public_html/wp-config.php(79): require_once('/home/besengumu...')
#2 /home/besengumus/public_html/wp-load.php(50): require_once('/home/besengumu...')
#3 /home/besengumus/public_html/wp-blog-header.php(13): require_once('/home/besengumu...')
#4 /home/besengumus/public_html/index.php(17): require('/home/besengumu...')
#5 {main}
  thrown in <b>/home/besengumus/public_html/wp-includes/rest-api/endpoints/class-wp-rest-template-revisions-controller.php</b> on line <b>17</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/besengumus/public_html/wp-includes/l10n.php:850
Stack trace:
#0 /home/besengumus/public_html/wp-includes/l10n.php(953): load_textdomain('default', '/home/besengumu...', 'tr_TR')
#1 /home/besengumus/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/besengumus/public_html/wp-includes/l10n.php</b> on line <b>850</b><br />