Ios WEb Service Communication

I am trying to upload an image from my device to the server and each time the else condition executes... Please help me sending the right request from device to server
<?php

include 'colorsofimage.php';
include 'include/functions.php';

$base = $_REQUEST["image"];

if (isset($base)) {

    $image_name = "img_" . date("Y-m-d-H-m-s") . ".jpg";
    $binary = base64_decode($base);
    // binary, utf-8 bytes
    header("Content-Type: bitmap; charset=utf-8");
    $file = fopen("images/post_images/" . $image_name, "wb");
    if($file){
        echo 'sucess';
    }else{
        echo 'error';
    }
    die();

    fwrite($file, $binary);
    fclose($file);
    mysql_connect('localhost', 'root', '');
    mysql_select_db('colorsearch');
    mysql_query("INSERT INTO image(name)VALUE('$image_name')");
    $last_id = mysql_insert_id();
    $src = 'images/post_images/' . $image_name;
    $functions = new ColorsConversion();
    $image = new ColorsOfImage($src);
    $colors = $image->getProminentColors();
    $background = $image->getBackgroundColor();
    foreach ($colors as $color) {
//  mysql_query("INSERT INTO image_color(image_color,image_id) VALUE('$color','$last_id')");

        $rgb = $functions->hex2rgb($color);
        $hsv = $functions->RGBtoHSV($rgb[0], $rgb[1], $rgb[2]);
//
//        $rgb = hex2rgb($color);
//        $hsv = RGBtoHSV($rgb[0], $rgb[1], $rgb[2]);
        mysql_query("INSERT INTO image_color(image_color,image_background,image_color_r,image_color_g,image_color_b,image_color_h,image_color_s,image_color_v,image_id) VALUE('$color','$background','$rgb[0]','$rgb[1]','$rgb[2]','$hsv[0]','$hsv[1]','$hsv[2]','$last_id')");
    }
    die($image_name);
} else {

    die("No POST");
}
?>


And here is my code for uploading image

- (IBAction)btnUpload:(id)sender {

    if (self.imageViewGallery.image == nil) {
        UIAlertView *ErrorAlert = [[UIAlertView alloc] initWithTitle:@"Wait"
                                                             message:@"Please Select An Image To Upload." delegate:nil
                                                   cancelButtonTitle:@"OK"
                                                   otherButtonTitles:nil, nil];
        [ErrorAlert show];
        NSLog(@"error");
    }
    else{
    NSData *imageData = UIImageJPEGRepresentation(self.imageViewGallery.image, 90);
    NSString *urlString = @"http://localhost/ColorPicker/api.upload.php";


    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];

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


    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Disposition: form-data; name=\"userfile\"; filename=\"iphonefile.jpg\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:body];


    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"returnstring is : %@",returnString);
    if (returnString != nil) {
        UIAlertView *uploadAlert = [[UIAlertView alloc] initWithTitle:@"Hooray!"
                                                             message:@"Your Image is uploaded" delegate:nil
                                                   cancelButtonTitle:@"OK"
                                                   otherButtonTitles:nil, nil];
        [uploadAlert show];

    }
    else
    {
        UIAlertView *ErrorAlert = [[UIAlertView alloc] initWithTitle:@"Oops"
                                                             message:@"Image Couldn't uploaded." delegate:nil
                                                   cancelButtonTitle:@"OK"
                                                   otherButtonTitles:nil, nil];
        [ErrorAlert show];


    }
    }

}