How to upload images through array on server?

In my application i have to upload mutiple images to server using php.

i am making an NSMutableArray *arrImages which hold's my images which are selected from gallery.

suppose if i select two images and try to upload.....i am able to upload only one images which is selected last....i had check my for loop...it's work fine ...but i am not able to upload all two images...please help me out.

following is my code:

- (IBAction)btnTakePicture_Clicked:(id)sender
{
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Select Image from..." delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Camera", @"Image Gallary", nil];
    actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
    actionSheet.alpha=0.90;
    actionSheet.tag = 1;
    [actionSheet showInView:self.view]; 
    [actionSheet release];
    UIButton *btn = (UIButton *)sender;
    intButton = btn.tag;
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    switch (actionSheet.tag) 
    {
        case 1:
            switch (buttonIndex)
        {
            case 0:
            {               
#if TARGET_IPHONE_SIMULATOR

                UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"Camera not available." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                [alert show];
                [alert release];

#elif TARGET_OS_IPHONE  

                UIImagePickerController *picker = [[UIImagePickerController alloc] init];  
                picker.sourceType = UIImagePickerControllerSourceTypeCamera;  
                picker.delegate = self;  
                //picker.allowsEditing = YES;  
                [self presentModalViewController:picker animated:YES];
                [picker release];

#endif  
            }
                break;
            case 1:
            {
                UIImagePickerController *picker = [[UIImagePickerController alloc] init];  
                picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
                picker.delegate = self;  
                [self presentModalViewController:picker animated:YES];
                [picker release];
            }
                break;
        }
            break;

        default:
            break;
    }   
}


-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
    NSData *dataImage = UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],1);
    UIImage *img = [[UIImage alloc] initWithData:dataImage];



    if (intButton == 0) 
    {

        imgView1.image=img;

    }
    else if (intButton == 1) 
    {
        imgView2.image=img;
    }
    else if (intButton == 2) 
    {
        imgView3.image=img;
    }
    else if (intButton == 3)
    {
        imgView4.image=img;

    }
    else if (intButton == 4)
    {
        imgView5.image=img;
    }
    else if (intButton == 5)
    {
        imgView6.image=img;
    }
    else if (intButton ==6)
    {
        imgView7.image=img;
    }
    else if (intButton ==7)
    {
        imgView8.image=img;
    }

    [arrImages addObject:dataImage];
    //NSLog(@"%@",dataImage);
    [picker dismissModalViewControllerAnimated:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

    [self.navigationController dismissModalViewControllerAnimated:YES]; 
}

this is my upload code

-(IBAction)upload:(id)sender
{
    if ([arrImages count]>0) 
    {

        NSString *urlString = @"http://your url.com/upload/uploader.php";

        // setting up the request object now

        NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
        [request setURL:[NSURL URLWithString:urlString]];
        [request setHTTPMethod:@"POST"];


        NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
        NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
        [request addValue:contentType forHTTPHeaderField: @"Content-Type"];


        NSMutableData *body = [NSMutableData data];





        for (int i = 0; i < [arrImages count]; i++)
        {

            //NSMutableData *body = [NSMutableData data];

            //[body appendData:[arrImages objectAtIndex:i] withFileName:@"image.jpg" andContentType:@"image/jpeg" forKey:[NSString stringWithFormat:@"image%d", i + 1]];


            [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];    

            [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"image%d.jpg\"\r\n",i + 1] dataUsingEncoding:NSUTF8StringEncoding]];

            [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

            //[body appendData:[NSData dataWithData:imageData]];
            [body appendData:[arrImages objectAtIndex:i]];          
            [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
            // setting the body of the post to the reqeust

            //[request setHTTPBody:body];
        }
        [request setHTTPBody:body];

        NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

        NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

        NSLog(@"%@",returnString);


    }

}

please help me out... i am try this from a long time..

Just a though, you SHOULD NOT use an Array to hold your UIImages. I have serious performance issues with that. What you should do, is to hold an array of paths to the images, on the moment you are going to upload the image, just use the path to get the image. In an iPhone 4 with more than 30 images from the gallery my app started to crash with memory warnings.

Edit (Actual answer for your question):

The problem is that before sending a new upload request, you should wait for the answer of the first. So:

-> upload 1 -> WAIT -> Upload Complete -> upload 2 -> WAIT -> Upload Complete...

Edit 2:

Dimple Panchal is right, you should do it in a asynchronous way.