php convert json to array object

In web development, it often involves submitting data in JSON format from the front-end page to the back-end, and then converting the data into an array or object form that PHP can operate. This article will introduce how to use PHP to convert JSON data into array objects.

JSON is a lightweight data exchange format with clear structure and easy to read and write. PHP has built-in JSON processing functions, which can easily convert JSON into array or object form.

Suppose we have the following JSON data:

{
    "name": "Tom",
    "age": 20,
    "address": {
        "province": "Guangdong",
        "city": "Guangzhou"
    },
    "hobbies": [
        "reading",
        "swimming"
    ]
}

Use PHP's json_decode() function to convert it into an array object. The usage of the function is as follows:

array|object json_decode(string $json[, bool $assoc = false[, int $depth = 512[, int $options = 0]]])

Parameter description:

• $json: JSON string that needs to be decoded.
• $assoc (optional): When this parameter is true, the array form will be returned, and if it is false, the object form will be returned. Defaults to false.
• $depth (optional): Set the maximum depth for parsing JSON data. The default is 512, and null will be returned if out of range.
• $options (optional): Set the JSON decoder options, such as JSON_BIGINT_AS_STRING, which can return large integers as strings.

Code example:

$jsonStr = '{ "name": "Tom", "age": 20, "address": { "province": "Guangdong", "city": "Guangzhou" }, "hobbies": [ "reading", "swimming" ] }';

$array = json_decode($jsonStr, true);

print_r($array);

Output result:

Array
(
    [name] => Tom
    [age] => 20
    [address] => Array
        (
            [province] => Guangdong
            [city] => Guangzhou
        )

    [hobbies] => Array
        (
            [0] => reading
            [1] => swimming
        )
)

As you can see, the json_decode() function converts the JSON string into PHP Array object.

If you want to convert JSON data into PHP object form, you can remove the second parameter in the function or set it to false.

In addition to converting JSON data into array or object form, PHP can also encode data in array or object form into JSON string. This can be achieved using PHP's json_encode() function. Function usage is as follows:

string json_encode(mixed $value[, int $options = 0[, int $depth = 512]])

Parameter description:

• $value: The value that needs to be encoded as a JSON string.
• $options (optional): Setting JSON encoder options, such as JSON_PRETTY_PRINT, can make the encoded JSON string easier to read.
• $depth (optional): Set the maximum depth of encoded JSON data. The default is 512, and an empty string will be returned if it exceeds the range.

Code example:

$array = array(
    'name' => 'Tom',
    'age' => 20,
    'address' => array(
        'province' => 'Guangdong',
        'city' => 'Guangzhou'
    ),
    'hobbies' => array(
        'reading',
        'swimming'
    )
);

$jsonStr = json_encode($array, JSON_PRETTY_PRINT);

echo $jsonStr;

Output result:

{
    "name": "Tom",
    "age": 20,
    "address": {
        "province": "Guangdong",
        "city": "Guangzhou"
    },
    "hobbies": [
        "reading",
        "swimming"
    ]
}

In actual development, AJAX technology is often used to submit JSON data to the back-end server, and then through PHP Convert it into actionable form. Mastering the above JSON-related PHP functions will make it easier to process JSON data.

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