如何将具有不同类型实体的两个数组组合为一个json对象

您可以使用您的两个数组，然后使用两个数组作为与这两个键关联的值，用两个键people和cars构建一个新的字典。例如：

NSArray *people = @[@{@"index":@"1",@"lastName":@"Brown",@"firstName":@"Kathy",@"company":@"ABC inc."},
                    @{@"index":@"2",@"lastName":@"Smith",@"firstName":@"Mike",@"company":@"XYZ inc."}];
NSArray *cars = @[@{@"index":@"1",@"make":@"Toyota",@"model":@"RAV4",@"year":@"2009"},
                  @{@"index":@"2",@"make":@"Honda",@"model":@"Pilot",@"year":@"2012"}];
NSDictionary *fullDictionary = @{@"people": people, @"cars": cars};
NSError *error;
NSData *data = [NSJSONSerialization dataWithJSONObject:fullDictionary options:0 error:&error];

生成的JSON（格式化后可以更容易地读取）看起来像：

{
  "cars" : [
    {
      "model" : "RAV4",
      "year" : "2009",
      "make" : "Toyota",
      "index" : "1"
    },
    {
      "model" : "Pilot",
      "year" : "2012",
      "make" : "Honda",
      "index" : "2"
    }
  ],
  "people" : [
    {
      "lastName" : "Brown",
      "firstName" : "Kathy",
      "company" : "ABC inc.",
      "index" : "1"
    },
    {
      "lastName" : "Smith",
      "firstName" : "Mike",
      "company" : "XYZ inc.",
      "index" : "2"
    }
  ]
}

要发送该请求，您可以执行以下操作：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
request.HTTPBody = data;
request.HTTPMethod = @"POST";
NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    // check for fundamental networking error (e.g. not connected to Internet)
    if (error) {
        NSLog(@"error = %@", error);
        return;
    }
    // also check to see if the server reported some HTTP error
    if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
        NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
        if (statusCode != 200) {
            NSLog(@"statusCode = %ld", (long)statusCode);
            return;
        }
    }
    // OK, if we've gotten here, let's parse the response; I'm assuming you'll send JSON response; so parse it
    NSError *parseError;
    NSDictionary *responseObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
    if (parseError) {
        NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        NSLog(@"responseString = %@", responseString);
    } else {
        NSLog(@"responseObject = %@", responseObject);
    }
}];
[task resume];

在PHP中，要解析此响应，可以执行以下操作：

<?php
header("Content-Type: application/json");
$handle = fopen("php://input", "rb");
$raw_post_data = '';
while (!feof($handle)) {
    $raw_post_data .= fread($handle, 8192);
}
fclose($handle);
$json_data = json_decode($raw_post_data, true);
$people = $json_data["people"];
$cars = $json_data["cars"];
foreach ($people as $person) {
    $index      = $person["index"];
    $last_name  = $person["lastName"];
    $first_name = $person["firstName"];
    $company    = $person["company"];
    // use these four variables to insert row of data here; note, make sure you either use 
    // `mysqli::real_escape_string` or that you manually bind these values to `?` placeholders
}
foreach ($cars as $car) {
    $index = $car["index"];
    $make  = $car["make"];
    $model = $car["model"];
    $year  = $car["year"];
    // again, use these four variables to insert row of data here; note, make sure you either use 
    // `mysqli::real_escape_string` or that you manually bind these values to `?` placeholders
}
// obviously, if we had errors above, we'd send something like Array("success" => false, ...) with error messages and error codes
$response = Array("success" => true);
echo json_encode($response);
?>

在PHP中，您可以像下面的一样组合两个json

$j1 = '[{"index":"1","lastName":"Brown","firstName":"Kathy","company":"ABC inc."},
    {"index":"2","lastName":"Smith","firstName":"Mike","company":"XYZ inc."}]';
$j2 = '[{"index":"1","make":"Toyota","model":"RAV4","year":"2009"},
    {"index":"2","make":"Honda","model":"Pilot","year":"2012"}]';
$combined_array = array("People"=>json_decode($j1, true)) + array("Cars"=>json_decode($j2, true));
$combined_json = json_encode($combined_array);
print_r($combined_array);
print_r($combined_json);

输出：

Array
(
    [Peolpe] => Array
        (
            [0] => Array
                (
                    [index] => 1
                    [lastName] => Brown
                    [firstName] => Kathy
                    [company] => ABC inc.
                )
            [1] => Array
                (
                    [index] => 2
                    [lastName] => Smith
                    [firstName] => Mike
                    [company] => XYZ inc.
                )
        )
    [Cars] => Array
        (
            [0] => Array
                (
                    [index] => 1
                    [make] => Toyota
                    [model] => RAV4
                    [year] => 2009
                )
            [1] => Array
                (
                    [index] => 2
                    [make] => Honda
                    [model] => Pilot
                    [year] => 2012
                )
        )
)
{"Peolpe":[{"index":"1","lastName":"Brown","firstName":"Kathy","company":"ABC inc."},
    {"index":"2","lastName":"Smith","firstName":"Mike","company":"XYZ inc."}],
"Cars":[{"index":"1","make":"Toyota","model":"RAV4","year":"2009"},
    {"index":"2","make":"Honda","model":"Pilot","year":"2012"}]}

如果要打印json字符串的输出，可以使用json_encode 的JSON_PRETTY_PRINT选项

$combined_json = json_encode($combined_array, JSON_PRETTY_PRINT);