WP_Site_Health::get_page_cache_detail(): WP_Error|array

3520	private function get_page_cache_detail() {3521		$page_cache_detail = $this->check_for_page_caching();3522		if ( is_wp_error( $page_cache_detail ) ) {3523			return $page_cache_detail;3524		}3525 3526		// Use the median server response time.3527		$response_timings = $page_cache_detail['response_timing'];3528		rsort( $response_timings );3529		$page_speed = $response_timings[ floor( count( $response_timings ) / 2 ) ];3530 3531		// Obtain unique set of all client caching response headers.3532		$headers = array();3533		foreach ( $page_cache_detail['page_caching_response_headers'] as $page_caching_response_headers ) {3534			$headers = array_merge( $headers, array_keys( $page_caching_response_headers ) );3535		}3536		$headers = array_unique( $headers );3537 3538		// Page cache is detected if there are response headers or a page cache plugin is present.3539		$has_page_caching = ( count( $headers ) > 0 || $page_cache_detail['advanced_cache_present'] );3540 3541		if ( $page_speed && $page_speed < $this->get_good_response_time_threshold() ) {3542			$result = $has_page_caching ? 'good' : 'recommended';3543		} else {3544			$result = 'critical';3545		}3546 3547		return array(3548			'status'                 => $result,3549			'advanced_cache_present' => $page_cache_detail['advanced_cache_present'],3550			'headers'                => $headers,3551			'response_time'          => $page_speed,3552		);3553	}