How to convert json into array object array object in php

During the encoding process, transmitting data in JSON format is a very common operation. PHP provides a function called json_decode() for converting JSON strings into PHP values. This article explains how to use PHP to convert JSON to arrays and objects.

Convert to array using json_decode()

Suppose we have the following JSON string:

{
    "name": "Tom",
    "age": 30,
    "hobbies": ["reading", "running", "swimming"],
    "address": {
        "city": "Beijing",
        "country": "China"
    }
}

Now we need to convert it to a PHP array. We can use the json_decode() function and set the second parameter to true to convert the JSON string into an associative array. The code is as follows:

$jsonString = '{"name":"Tom","age":30,"hobbies":["reading","running","swimming"],"address":{"city":"Beijing","country":"China"}}';
$assocArray = json_decode($jsonString, true);
print_r($assocArray);

The output result is:

Array
(
    [name] => Tom
    [age] => 30
    [hobbies] => Array
        (
            [0] => reading
            [1] => running
            [2] => swimming
        )

    [address] => Array
        (
            [city] => Beijing
            [country] => China
        )

)

As you can see, we successfully converted the JSON string into a PHP array and printed the result.

Use json_decode() Convert to object

In addition to converting a JSON string to a PHP array, we can also convert it to a PHP object. Similarly, we can use the json_decode() function and set the second parameter to false or omit it to convert the JSON string into an object, the code is as follows:

$jsonString = '{"name":"Tom","age":30,"hobbies":["reading","running","swimming"],"address":{"city":"Beijing","country":"China"}}';
$obj = json_decode($jsonString);
var_dump($obj);

The output result is:

object(stdClass)#1 (4) {
  ["name"]=>
  string(3) "Tom"
  ["age"]=>
  int(30)
  ["hobbies"]=>
  array(3) {
    [0]=>
    string(7) "reading"
    [1]=>
    string(7) "running"
    [2]=>
    string(8) "swimming"
  }
  ["address"]=>
  object(stdClass)#2 (2) {
    ["city"]=>
    string(7) "Beijing"
    ["country"]=>
    string(5) "China"
  }
}

As you can see, we successfully converted the JSON string into a PHP object and printed the result.

Use json_decode() Convert to object array

In some cases, we need to convert a JSON string into multiple PHP objects. In this case, we can first convert it to a PHP array and then use the array mapping function to convert it to an array of PHP objects. The code is as follows:

$jsonString = '[{"name":"Tom","age":30},{"name":"Alice","age":25},{"name":"Bob","age":40}]';
$array = json_decode($jsonString, true);
$objArray = array_map(function($item) {
    return (object) $item;
}, $array);
print_r($objArray);

The output result is:

Array
(
    [0] => stdClass Object
        (
            [name] => Tom
            [age] => 30
        )

    [1] => stdClass Object
        (
            [name] => Alice
            [age] => 25
        )

    [2] => stdClass Object
        (
            [name] => Bob
            [age] => 40
        )

)

As you can see, we successfully converted the JSON string into a PHP object array and printed the result.

In short, PHP provides a very convenient way to convert JSON strings into PHP arrays and objects. We just need to use the json_decode() function and specify the appropriate parameters. This is useful because most web APIs return data in JSON.

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