get request data in laravel

my request is like as below:

Illuminate\Http\Request {#43 ▼ #json: null #convertedFiles: null #userResolver: Closure($guard = null) {#301 ▶} #routeResolver: Closure() {#310 ▶} +attributes: Symfony\Component\HttpFoundation\ParameterBag {#45 ▶} +request: Symfony\Component\HttpFoundation\InputBag {#44 ▼ #parameters: array:3 [▼ "_token" => "bwF45UcVom2gg6WxCTM6zSWXB1WTuAnOCZ1idASA" "Subject" => "CP1W-AD042" "$contentdetail" => array:6 [▼ 0 => "..\data\plc\cp\analog\cp1w-ad041-ad042\CP1W-AD041_AD042_Settings.png" 1 => "..\data\plc\cp\analog\cp1w-ad041-ad042\CP1W-AD041_AD042_Specifications.png" 2 => "..\data\plc\cp\analog\cp1w-ad041-ad042\CP1W-AD041_AD042_TerminalArrangement.png" 3 => "..\data\plc\cp\analog\cp1w-ad041-ad042\CP1W-AD041_AD042_Wiring.png" 4 => "..\data\plc\cp\analog\cp1w-ad041-ad042\CP1W-AD041_AD042_ProgramExample.png" 5 => "..\data\plc\cp\analog\cp1w-ad041-ad042\CP1W-AD041_AD042_ProgramExample2.png" ] ] } +query: Symfony\Component\HttpFoundation\InputBag {#51 ▶} +server: Symfony\Component\HttpFoundation\ServerBag {#47 ▶} +files: Symfony\Component\HttpFoundation\FileBag {#48 ▶} +cookies: Symfony\Component\HttpFoundation\InputBag {#46 ▶} +headers: Symfony\Component\HttpFoundation\HeaderBag {#49 ▶} #content: null #languages: null #charsets: null #encodings: null #acceptableContentTypes: null #pathInfo: "/admin/contents/update/2" #requestUri: "/data/admin/contents/update/2" #baseUrl: "/data" #basePath: null #method: "POST" #format: null #session: Illuminate\Session\Store {#350 ▶} #locale: null #defaultLocale: "en" -preferredFormat: null -isHostValid: true -isForwardedValid: true -isSafeContentPreferred: null basePath: "/data" format: "html" }

how I can get data on contentdetail under the parameters of the request? I want to update that in the database