WP_REST_Comments_Controller::get_items() WordPress Method

	public function get_items( $request ) {

		// Retrieve the list of registered collection query parameters.
		$registered = $this->get_collection_params();

		/*
		 * This array defines mappings between public API query parameters whose
		 * values are accepted as-passed, and their internal WP_Query parameter
		 * name equivalents (some are the same). Only values which are also
		 * present in $registered will be set.
		 */
		$parameter_mappings = array(
			'author'         => 'author__in',
			'author_email'   => 'author_email',
			'author_exclude' => 'author__not_in',
			'exclude'        => 'comment__not_in',
			'include'        => 'comment__in',
			'offset'         => 'offset',
			'order'          => 'order',
			'parent'         => 'parent__in',
			'parent_exclude' => 'parent__not_in',
			'per_page'       => 'number',
			'post'           => 'post__in',
			'search'         => 'search',
			'status'         => 'status',
			'type'           => 'type',
		);

		$prepared_args = array();

		/*
		 * For each known parameter which is both registered and present in the request,
		 * set the parameter's value on the query $prepared_args.
		 */
		foreach ( $parameter_mappings as $api_param => $wp_param ) {
			if ( isset( $registered[ $api_param ], $request[ $api_param ] ) ) {
				$prepared_args[ $wp_param ] = $request[ $api_param ];
			}
		}

		// Ensure certain parameter values default to empty strings.
		foreach ( array( 'author_email', 'search' ) as $param ) {
			if ( ! isset( $prepared_args[ $param ] ) ) {
				$prepared_args[ $param ] = '';
			}
		}

		if ( isset( $registered['orderby'] ) ) {
			$prepared_args['orderby'] = $this->normalize_query_param( $request['orderby'] );
		}

		$prepared_args['no_found_rows'] = false;

		$prepared_args['date_query'] = array();

		// Set before into date query. Date query must be specified as an array of an array.
		if ( isset( $registered['before'], $request['before'] ) ) {
			$prepared_args['date_query'][0]['before'] = $request['before'];
		}

		// Set after into date query. Date query must be specified as an array of an array.
		if ( isset( $registered['after'], $request['after'] ) ) {
			$prepared_args['date_query'][0]['after'] = $request['after'];
		}

		if ( isset( $registered['page'] ) && empty( $request['offset'] ) ) {
			$prepared_args['offset'] = $prepared_args['number'] * ( absint( $request['page'] ) - 1 );
		}

		/**
		 * Filters WP_Comment_Query arguments when querying comments via the REST API.
		 *
		 * @since 4.7.0
		 *
		 * @link /reference/classes/wp_comment_query/
		 *
		 * @param array           $prepared_args Array of arguments for WP_Comment_Query.
		 * @param WP_REST_Request $request       The REST API request.
		 */
		$prepared_args = apply_filters( 'rest_comment_query', $prepared_args, $request );

		$query        = new WP_Comment_Query;
		$query_result = $query->query( $prepared_args );

		$comments = array();

		foreach ( $query_result as $comment ) {
			if ( ! $this->check_read_permission( $comment, $request ) ) {
				continue;
			}

			$data       = $this->prepare_item_for_response( $comment, $request );
			$comments[] = $this->prepare_response_for_collection( $data );
		}

		$total_comments = (int) $query->found_comments;
		$max_pages      = (int) $query->max_num_pages;

		if ( $total_comments < 1 ) {
			// Out-of-bounds, run the query again without LIMIT for total count.
			unset( $prepared_args['number'], $prepared_args['offset'] );

			$query                  = new WP_Comment_Query;
			$prepared_args['count'] = true;

			$total_comments = $query->query( $prepared_args );
			$max_pages      = ceil( $total_comments / $request['per_page'] );
		}

		$response = rest_ensure_response( $comments );
		$response->header( 'X-WP-Total', $total_comments );
		$response->header( 'X-WP-TotalPages', $max_pages );

		$base = add_query_arg( urlencode_deep( $request->get_query_params() ), rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ) );

		if ( $request['page'] > 1 ) {
			$prev_page = $request['page'] - 1;

			if ( $prev_page > $max_pages ) {
				$prev_page = $max_pages;
			}

			$prev_link = add_query_arg( 'page', $prev_page, $base );
			$response->link_header( 'prev', $prev_link );
		}

		if ( $max_pages > $request['page'] ) {
			$next_page = $request['page'] + 1;
			$next_link = add_query_arg( 'page', $next_page, $base );

			$response->link_header( 'next', $next_link );
		}

		return $response;
	}