How to convert JSON data into array object in php

During the development process, we often involve scenarios of converting JSON data into arrays or object arrays. As a popular server-side programming language, PHP also provides convenient methods to perform conversion operations when processing JSON data. This article uses an example to demonstrate how to convert JSON data into an array of array objects.

Prerequisite knowledge

Before explaining the specific operations, you need to understand some basic PHP knowledge.

JSON

JSON (short for JavaScript Object Notation) is a lightweight data exchange format. It represents data as key-value pairs or array format. JSON data can be represented using objects and arrays in JavaScript.

Array in PHP

In PHP, an array is a structure that collects data. It can store different types of values. In an array, each value has a key associated with it, and the key can be any string or integer.

stdClass object in PHP

stdClass object is a very simple object model in PHP. It can dynamically allocate properties as needed. In addition, it can also convert objects into arrays or Arrays are converted to objects, which is useful for working with JSON data.

Convert Json to Array

Let’s first take a look at how to convert JSON data into a PHP array. PHP provides a built-in function json_decode(), which can convert a JSON string into a PHP array. The usage of this function is as follows:

mixed json_decode ( string $json [, bool $assoc = FALSE [, int $depth = 512 [, int $options = 0 ]]] )

Among them, $json represents the JSON string that needs to be converted; $assoc represents whether to return an associative array (the default is false, which means returning an object); $depth represents the maximum recursion depth (default is 512); $options represents conversion options (default is 0).

Here is a simple example, assuming we have a file containing JSON datadata.json:

{
    "name": "Typechoer",
    "age": 25,
    "gender": "male",
    "skills": ["PHP", "JavaScript", "CSS"]
}

We can use the following code to read the JSON data and It is converted into a PHP array:

$json = file_get_contents('data.json');
$data = json_decode($json, true);
print_r($data);

The output result is as follows:

Array
(
    [name] => Typechoer
    [age] => 25
    [gender] => male
    [skills] => Array
        (
            [0] => PHP
            [1] => JavaScript
            [2] => CSS
        )
)

As you can see, we have implemented the operation of converting JSON data into a PHP array, and the type of data remains unchanged.

Convert Json to object array

In addition to converting JSON data into a PHP array, you can also convert it into an object array. An object array is an array of stdClass objects, where each object represents an element. We don't need to care about the field names of the object, we only need to access them through the properties of the object. The following is a method to convert JSON data into an array of PHP objects:

json_decode(string, false, 512, JSON_OBJECT_AS_ARRAY);

As you can see, we only need to set the $assoc parameter to false, set the $options parameter to JSON_OBJECT_AS_ARRAY, and then use the json_decode() function Just perform the conversion operation.

Similarly based on the above JSON data, we can use the following code to convert it into a PHP object array:

$json = file_get_contents('data.json');
$data = json_decode($json, false, 512, JSON_OBJECT_AS_ARRAY);
print_r($data);

The output result is as follows:

Array
(
    [name] => Typechoer
    [age] => 25
    [gender] => male
    [skills] => Array
        (
            [0] => PHP
            [1] => JavaScript
            [2] => CSS
        )
)

Since an object array is used , so we can use object properties to access data, for example:

echo $data[0]->name; // Typechoer
echo $data[0]->skills[2]; // CSS

Json converted into a multi-dimensional array

If the JSON data has sub-objects or arrays nested in it, then converted into a PHP array or object When using an array, we can still maintain the multi-dimensional nature of the data.

The following is an example of JSON data with a nested structure:

{
    "account": {
        "name": "Tom",
        "age": 28
    },
    "courses": [
        {
            "name": "PHP",
            "hour": 80
        },
        {
            "name": "JavaScript",
            "hour": 60
        }
    ]
}

We can use the following code to convert it into a PHP array:

$json = file_get_contents('data.json');
$data = json_decode($json, true);
print_r($data);

The output result is as follows:

Array
(
    [account] => Array
        (
            [name] => Tom
            [age] => 28
        )

    [courses] => Array
        (
            [0] => Array
                (
                    [name] => PHP
                    [hour] => 80
                )

            [1] => Array
                (
                    [name] => JavaScript
                    [hour] => 60
                )

        )

)

Similarly, we can also convert it into a PHP object array:

$json = file_get_contents('data.json');
$data = json_decode($json, false, 512, JSON_OBJECT_AS_ARRAY);
print_r($data);

The output result is as follows:

Array
(
    [account] => Array
        (
            [name] => Tom
            [age] => 28
        )

    [courses] => Array
        (
            [0] => Array
                (
                    [name] => PHP
                    [hour] => 80
                )

            [1] => Array
                (
                    [name] => JavaScript
                    [hour] => 60
                )

        )

)

As you can see, the structure of multi-dimensional data is preserved.

Summary

In this article, we introduced how to convert JSON data into a PHP array or object array. Using PHP's built-in function json_decode(), we can quickly convert between JSON data and PHP data. If you need to deal with JSON data in development, then this knowledge will definitely help you.

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