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 calledjson_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 usingjson_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 thejson_decode()function and set the second parameter totrueto 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.

Usejson_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 thejson_decode()function and set the second parameter tofalseor 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.

Usejson_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 thejson_decode()function and specify the appropriate parameters. This is useful because most web APIs return data in JSON.

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