How to convert json data to array in php

With the development of the Internet, data has become one of the basic elements of network applications. In the development model where the front and back ends are separated, data is usually transferred in JSON format. When processing data, we need to convert the JSON data into a PHP array in order to get the data in it and operate on it.

JSON (JavaScript Object Notation) is a lightweight data exchange format with good readability and cross-language support, so it is widely used in network data transmission. PHP is a popular programming language and many websites and applications are written in PHP. Therefore, processing JSON data in PHP is particularly important.

This article will introduce how to use the built-in functions in PHP to convert JSON data into a PHP array, and how to perform data operations on this basis. The following are the implementation steps:

1. Obtain JSON data

First, we need to obtain JSON data. In practical applications, JSON data is usually obtained through a network API or reading from a file. Here, we assume that the JSON data has been obtained and stored in a string variable.

$json_data = '{"name":"John", "age":30, "city":"New York"}';

2. Parse JSON data

Next, we need to parse the JSON data into a PHP array. PHP provides the built-in function json_decode() for parsing. This function decodes JSON data into a PHP object or array, depending on the setting of the second parameter. We can set the second parameter to true, which tells the function to return an array.

$php_array = json_decode($json_data, true);

Now, $php_array will contain the parsed PHP array, where each attribute value corresponds to a key-value pair in the JSON data.

3. Access the values ​​in the PHP array

We can access the values ​​in the PHP array through the array operator[], just like accessing the ordinary PHP array Same. For example, if we want to get the value of the name attribute, we can use the following code:

$name = $php_array['name'];

Similarly, we can also use array operators to modify the values ​​in the array.

4. Serialize PHP array into JSON data

Sometimes, we need to convert PHP array into JSON data. At this time, we can use the built-in function json_encode(). Unlike json_decode(), the first parameter of this function is a PHP array and returns a JSON string.

$json_data = json_encode($php_array);

Now, $json_data will contain the serialized JSON data.

5. Summary

This article introduces how to convert JSON data into a PHP array, and introduces methods of accessing arrays and serializing to JSON data in PHP. These methods are basic operations for processing JSON data and can help us better process network data. Hope this article will be helpful to PHP developers.

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