How to convert JSON data into strings, objects and arrays in php

In PHP development, we often encounter the need to convert JSON arrays into strings, objects, arrays, and object arrays. These conversions require the use of PHP built-in functions and some basic knowledge. This article will introduce how to use PHP to convert JSON data into strings, objects, and arrays. I hope it will be helpful to PHP developers.

1. Convert JSON data to string

Use the PHP built-in function json_decode() to convert a string in JSON format into a PHP array or object. In order to convert a JSON array to a string, you need to first decode the JSON array into an array or object and then encode it into a string using the json_encode() function. Here is an example:

$json = '[{"name": "John", "age": 30}, {"name": "Jane", "age": "25"}]';
$array = json_decode($json, true);
$string = json_encode($array);

echo $string;
// 输出：[{"name":"John","age":30},{"name":"Jane","age":25}]

In the above example, the JSON array is decoded into a PHP array using the json_decode() function and it is decoded using the json_encode() function Encoded as a string.

2. Convert JSON data to objects

Converting JSON arrays to objects is similar to converting JSON arrays to strings. You also need to use the json_decode() function to The JSON array is decoded into an object, which can then be manipulated like an object. Here is an example:

$json = '{"name": "John", "age": 30}';
$obj = json_decode($json);

echo $obj->name;
// 输出：John
echo $obj->age;
// 输出：30

In the above example, the JSON data is decoded into an object using the json_decode() function and the value is accessed through the object property name.

3. Convert JSON data to array

Converting JSON array to PHP array is similar to converting JSON array to string and object. You need to use the json_decode() function to decode the JSON array into an array, and then you can operate it like an array. Here is an example:

$json = '[{"name": "John", "age": 30}, {"name": "Jane", "age": 25}]';
$array = json_decode($json, true);

echo $array[0]['name'];
// 输出：John
echo $array[1]['age'];
// 输出：25

In the above example, the JSON array is decoded into a PHP array using the json_decode() function and the values ​​are accessed by array index and key name.

4. Convert JSON data into object array

In PHP development, it is often necessary to convert JSON array into object array. An object array is an array of multiple objects, each with the same properties and methods. When converting a JSON array into an object array, you need to first decode the JSON array into a PHP array, and convert each object in the array into a PHP object by traversing the array. Here is an example:

$json = '[{"name": "John", "age": 30}, {"name": "Jane", "age": 25}]';
$array = json_decode($json, true);

$objects = array();
foreach ($array as $item) {
    $obj = (object) $item;
    $objects[] = $obj;
}

echo $objects[0]->name;
// 输出：John
echo $objects[1]->age;
// 输出：25

In the above example, the JSON array is decoded into a PHP array using the json_decode() function, and then foreach is used to loop through each array items, and use a cast to convert the array items to objects, and finally add the objects to the new array. The finally obtained $objects array is an object array.

Summary

This article introduces how to use PHP to convert a JSON array into a string, object, array, or object array. These conversions are very commonly used for data processing in PHP development, and I hope they can be helpful to PHP developers.

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