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我试图将 JSON 字符串发布到 php。我创建了 JSON 作为

NSMutableArray *arr = [[NSMutableArray alloc] init];
    [arr addObject:@{@"step1":[[NSArray alloc] initWithObjects:@{@"key1":@"value1"}, @{@"key2":@"value2"}, @{@"key3":@"value3"}, nil]}];
     [arr addObject:@{@"step2":[[NSArray alloc] initWithObjects:@{@"key1":@"value1"}, @{@"key2":@"value2"}, @{@"key3":@"value3"}, nil]}];
    jsonString = [NSJSONSerialization JSONObjectWithData: [NSJSONSerialization dataWithJSONObject:arr options:NSJSONWritingPrettyPrinted error:nil] options:NSJSONReadingMutableContainers error:nil];
NSLog(@"JSON %@",jsonString);

它将json打印为

JSON (
        {
        step1 =         (
                        {
                key1 = value1;
            },
                        {
                key2 = value2;
            },
                        {
                key3 = value3;
            }
        );
    },
        {
        step2 =         (
                        {
                key1 = value1;
            },
                        {
                key2 = value2;
            },
                        {
                key3 = value3;
            }
        );
    }
)

我正在请求发送 json 字符串，如下所示

 NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"2", @"userid",jsonString , @"totaldata", nil];
AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:url]];
[client registerHTTPOperationClass:[AFJSONRequestOperation class]];
    NSLog(@"Requesting..");
    [client postPath:@"" parameters:params success:^(AFHTTPRequestOperation *operation, id response){
        NSLog(@"AFN response %@", operation.responseString);
        NSError *error;
        NSDictionary *responseData = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingAllowFragments error:&error];
        complete(responseData);
    }
    failure:^(AFHTTPRequestOperation *operation, NSError *error)
     {
         NSDictionary *nsDError = [NSDictionary dictionaryWithObjectsAndKeys:error.description, @"error", nil];
         failure(nsDError);
     }];
}

当我从 php 打印它时，我得到的响应为

{"json":[{"step1":[{"key1":"value1"}]},{"step1":[{"key2":"value2"}]},{"step1":[{"key3":"value3"}]},{"step2":[{"key1":"value1"}]},{"step2":[{"key2":"value2"}]},{"step2":[{"key3":"value3"}]}]}

我的php脚本，

$totaldata = $_POST["totaldata"];
$response = array("json"=>$totaldata);        
 $this->response($response,200);

在 php 中，我只是打印 json 字符串以响应 json 请求。我期望 json 在请求和响应中是相等的，但是作为响应，json 会随着请求的 json 字符串而变化。有人可以在这方面帮助我吗？

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