How to send multiple parameterts to PHP server in HTTP post

Question

I'm sending base64 string to php server and its working well. Now I want to send another parameter as a string. Can anyone tell me what code need to add in below code.

Below code is working good for single parameter. How can we modify it for multiple parameters?

 NSData *data = [UIImageJPEGRepresentation(imgeview.image,90) base64Encoding];

// Create your request string with parameter name as defined in PHP file
NSString *myRequestString = [NSString stringWithFormat:@"question_image=%@",data];
myRequestString = [myRequestString stringByReplacingOccurrencesOfString:
                                             @"+" withString:@"%2B"];

// Create Data from request
NSData *myRequestData = [NSData dataWithBytes:[myRequestString UTF8String] 
                                       length:[myRequestString length]];
request = [[NSMutableURLRequest alloc] initWithURL:
    [NSURL URLWithString:@"http://192.168.0.101/Mobile_tutor/webservice/question_details.php"]];
// set Request Type
[request setHTTPMethod:@"POST"];
// Set content-type
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
// Set Request Body
[request setHTTPBody:myRequestData];
// Now send a request and get Response
NSData *returnData = [NSURLConnection sendSynchronousRequest:request 
                                           returningResponse:nil 
                                                       error: nil];
// Log Response
NSString *response = [[NSString alloc] initWithBytes:[returnData bytes] 
                                              length:[returnData length]
                                            encoding:NSUTF8StringEncoding];
NSLog(@"-------------%@",response); // here you get reasponse string

Answer 1

For the network operation these is better supporting API like AFNetworking available witch work async and way better to handle

Tutorials for AFNetworking

Get from here

NSArray *keys = @[@"UserID", ];
NSArray *objects = @[@(userId)];

NSDictionary *parameter = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:
                            [NSURL URLWithString:BaseURLString]];
[httpClient setParameterEncoding:AFJSONParameterEncoding];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];

NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST"
                                                        path:@"services/UserService.svc/GetUserInfo"
                                                  parameters:parameter];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSError* error = nil;
    id jsonObject = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];
    if ([jsonObject isKindOfClass:[NSDictionary class]]) {
        // do what ever
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

}];