iOS到PHP的图像上传

我正试图通过php5将图像从IOS7上传到我的服务器。

iOS代码

NSString *urlString = @"http://<domain>/conAPI/imageAPI.php";
NSData *imageData = UIImagePNGRepresentation(venueImageView.image);
NSMutableURLRequest *requestImage = [[NSMutableURLRequest alloc] init];
    [requestImage setURL:[NSURL URLWithString:urlString]];
    [requestImage setHTTPMethod:@"POST"];
NSString *boundary = @"0xKhTmLbOuNdArY";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[requestImage addValue:contentType forHTTPHeaderField: @"Content-Type"];
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"'r'n--%@'r'n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name='"uploadedimage'"; filename='"V%@.png'"'r'n",[userDictioanry objectForKey:@"user_id"]] 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]];
[requestImage setHTTPBody:body];
NSData *returnData = [NSURLConnection sendSynchronousRequest:requestImage returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(@"Image Return String: %@", returnString);

和我的php

ini_set('log_errors',1);
$uploaddir = '/var/www/html/memberImages/';
print_r($_FILES);
$file = $_FILES['uploadedimage']['name'];
$uploadfile = $uploaddir . $file;
if (file_exists($uploaddir) && is_writable($uploaddir)) {
    if (move_uploaded_file($_FILES['uploadedimage']['tmp_name'], $uploadfile)) {
       echo 'DONE '.$file;
    }else {
        echo "error ".$_FILES['uploadedimage']['tmp_name'].' '.$uploadfile;
    }
}else {
    if (!file_exists($uploaddir)){
        echo 'upload dir does not exist '.getcwd().' '.$uploadfile.''n';
    }
    if(!is_writable($uploaddir)) {
        echo 'Upload directory is not writable.'.''n';
    }
}

在任何情况下，我都会返回带有两个文件名的"error"。error.log没有显示任何内容。root用户已对目录和所有父级进行了读/写操作。

你能指出我逻辑中的一个简单缺陷吗。如果这不涉及第三方方法，我也将不胜感激。在这种情况下，不使用AFNetworking是有正当理由的。

提前感谢Chris