php - Unable to upload image using AFNetworking AFURLSessionManager Multi-Part Request -

i trying upload image php service using afurlsessionmanager upload task multi-part request, progress.

however, server not receiving image. here code:

-(void) imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info {     [self dismissviewcontrolleranimated:yes completion:nil];     uiimage *pic = [info objectforkey:uiimagepickercontrollereditedimage];     self.profilepic.image = pic;     nsdata *picdata =uiimagejpegrepresentation(pic, 0.5);       nsmutabledictionary *parameters = [[nsmutabledictionary alloc]init];     [parameters setvalue:self.currentuser.userid forkey:@"id"];     [parameters setvalue:self.currentuser.token forkey:@"token"];      nsmutableurlrequest *request = [[afhttprequestserializer serializer] multipartformrequestwithmethod:@"post" urlstring:dpupdateurl parameters:parameters constructingbodywithblock:^(id<afmultipartformdata> formdata) {         [formdata appendpartwithfiledata:picdata name:@"image" filename:@"name.jpg" mimetype:@"image/jpeg"];         [formdata appendpartwithformdata:[[nsnumber numberwithint:picdata.length].stringvalue datausingencoding:nsutf8stringencoding] name:@"image"];     } error:nil];       afurlsessionmanager *manager = [[afurlsessionmanager alloc] initwithsessionconfiguration:[nsurlsessionconfiguration defaultsessionconfiguration]];      nsprogress *progress = nil;             nsurlsessionuploadtask *uploadtask = [manager uploadtaskwithstreamedrequest:request progress:&progress completionhandler:^(nsurlresponse *response, id responseobject, nserror *error) {         if (error) {             nslog(@"error: %@", error);         } else {             nslog(@"%@ %@", response, responseobject);          }     }];     [uploadtask resume];  } 

in php file using following code:

move_uploaded_file($_files['image']['tmp_name'],"../dp_images/$user_id.jpg" ); 

here response getting.

<nshttpurlresponse: 0x8d6f590> { url: http://www.appdomain.com/dp_update.php } { status code: 200, headers {     connection = "keep-alive";     "content-length" = 0;     "content-type" = "text/html";     date = "mon, 18 aug 2014 07:49:56 gmt";     "keep-alive" = "timeout=5, max=100";     server = apache; } } (null) 

is there doing wrong?? appreciate :)