如何将多维关联数组转换为JSON？

Question

As you can see in the JSON file, this looks not so necessary. I get values from input-s and add it to the array and send it via AJAX. A simple array I know how to convert, but a multidimensional one is not. Can eat what that function? I tried to create an array with "keys", but there is a lot of trouble, I never reached the end , and I'm sure it's not right. Tell me what you can do.

i want this
{   
   "user1" : {
      first_name":"Michael",
      "last_name":"Podlevskykh",
       "phones" : {
           "phone_1":"5345",
            "phone_2":"345345",
            "phone_3":"123"
        }
    }
}

---

 //this is what i see
JSON
[
    {"first_name":"Michael"},
    {"last_name":"Podlevskykh"},
        [{"phone_1":"5345"},
            {"phone_2":"345345"},
            {"phone_3":"0991215078"}
        ]
]

---

PHP

//[["5345", "345345", "123"], "Michael", "Podlevskykh"]

$userInfo = (json_decode($_POST["phones"], true));

$namePhones = ["phone_1", "phone_2", "phone_3"];
$nameUser = ["first_name", "last_name"];
$jsonPhones = $userInfo;
$nameLName = $userInfo;

$jsonPhones = array_splice($jsonPhones, 0, 1);
$nameLName = array_splice($nameLName, -2);

foreach ($jsonPhones[0] as $key => $value) {
    $phones[] = array($namePhones[$key] => $jsonPhones[0][$key]);
}

foreach ($nameLName as $key => $value) {
    $usersName[] = array($nameUser[$key] => $nameLName[$key]);
}

array_push($usersName, $phones);

echo "<pre>";
echo json_encode($usersName);
//[ 
 // {"first_name":"Michael"},{"last_name":"Podlevskykh"},
//  [{"phone_1":"5345"},{"phone_2":"345345"},{"phone_3":"123"}]
//]

Answer 1

I don't get all the complications, I would do something like this if I'm sure the $input format is the same:

<?php
$input = '[["5345", "345345", "123"], "Michael", "Podlevskykh"]';
$input = json_decode($input, true);

$output = [
    'user1' => [
        'first_name' => $input[1],
        'last_name' => $input[2],
        'phones' => [
            'phone_1' => $input[0][0],
            'phone_2' => $input[0][1],
            'phone_3' => $input[0][2]
        ]
    ]
];

echo '<pre>';
echo json_encode($output);