ios - swift unable to parse php data -

i have been trying fetch values database through poststring, doesn't return value. php tested , working fine, appreciated. below code.

import uikit  class displaydetailedviewcontroller: uiviewcontroller {      var role = string()     var date = string()     var city = string()     var mark_ref = string()      override func viewdidload() {         super.viewdidload()     }      override func didreceivememorywarning() {         super.didreceivememorywarning()     }      func getdata(){         let myurl = url(string:"http://xxxxxx.co.in/xxxxx/show_report1.php")          var request = urlrequest(url: myurl! url)         request.httpmethod = "post"          let poststring = "city=\(city)&date=\(date)&market_rep=\(mark_ref)"         request.httpbody = poststring.data(using: string.encoding.utf8)          let task = urlsession.shared.datatask(with: request) { (data: data?, response: urlresponse?, error: error?) in             dispatchqueue.main.async{                     if error != nil{                         print("error is\(string(describing: error))")                     }                     do{                         let json = try jsonserialization.jsonobject(with: data!, options: .mutablecontainers) as? nsdictionary                          if let parsejson = json {                              let myboard : string!                             myboard = parsejson["success"] as! string?                              print(myboard)                         }                     }                     catch {                         print(error)                     }             }          }         task.resume()        } } 

try 1: replace below line (nsdictionary)

let json = try jsonserialization.jsonobject(with: data!, options: .mutablecontainers) as? nsdictionary 

try 2: replace below line (nsarray)

let json = try jsonserialization.jsonobject(with: data!, options: .mutablecontainers) as? nsarray 

try 3: replace below line (nsstring)

let json = try jsonserialization.jsonobject(with: data!, options: .mutablecontainers) as? nsarray 

also try options: .mutablecontainers -> options: jsonserialization.readingoptions.allowfragments