How does php receive json array and convert array

When developing web applications, it is often necessary to use the JSON data format to transmit and receive data. As a PHP developer, we often need to convert JSON data passed from the front end into PHP arrays for processing. In this post, we will teach you how to convert a received JSON array into a PHP array using PHP.

1. Receive JSON data

To convert JSON data into a PHP array, you first need to receive JSON data. We can receive JSON data using $_POST or $_GET array in PHP.

For example, if the front end sends the following JSON data via POST request:

{
    "name": "张三",
    "age": 25,
    "address": "北京市朝阳区"
}

Then in PHP, we can use the following code to receive the JSON data and store it in the variable $json:

$json = $_POST['json']; // 假设json参数是前端发送的JSON数据

2. Convert JSON data to PHP array

After receiving the JSON data, we need to convert it to a PHP array. PHP provides the built-in function json_decode() to do this. The syntax of this function is:

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

where $json is the JSON data to be decoded, $assoc is an optional Boolean value used to indicate whether to convert the JSON object into an associative array (default is false, That is, converting JSON objects into standard objects), $depth is an optional integer used to specify the maximum depth of the decoder's recursive structure (default is 512), $options is an optional integer used to specify the decoder behavior Various options (default 0).

We can use the following code to convert the received JSON data into a PHP array:

$data = json_decode($json, true); // 将JSON数据转换为关联数组

Note that if the $assoc parameter is not set to true, the json_decode() function will return a standard object instead of an array. Therefore, be sure to remember to set this parameter to true when calling this function.

3. Processing PHP Arrays

Once the JSON data is successfully converted into a PHP array, we can perform any operation on it. For example, we can output the values ​​of some array elements:

echo $data['name'];     // 将输出"张三"
echo $data['age'];      // 将输出25
echo $data['address'];  // 将输出"北京市朝阳区"

Or we can do a loop over the array:

foreach ($data as $key => $value) {
    echo $key . ': ' . $value . '<br>';
}

Anyway, once the JSON data is converted to a PHP array, we can process it like It is operated on like any other PHP array.

To summarize, this article details how to convert a received JSON array into a PHP array. How you use this technique will depend on the specific needs of the application you are developing. However, this tutorial provides the basic knowledge developers need so that they can use it according to their needs.

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