PHP data structure: JSON data processing, understanding the standards for data exchange and storage

JSON is a text data format used for data exchange and storage. PHP provides json_encode() and json_decode() functions to process JSON data. These functions allow you to encode PHP variables to JSON strings and decode JSON strings to PHP variables. You can also configure decoding options using the assoc parameter and use recursive methods to process nested data structures.

PHP Data Structure: JSON Data Processing Guide

Introduction

JSON( JavaScript Object Notation) is a lightweight data format widely used for data exchange and storage. It is a text-based data format commonly used to transfer data between clients and servers.

JSON Syntax

JSON consists of the following basic data types:

• String: text enclosed in quotes
• Number: Integer or floating point number
• Boolean value: true or false
• Array: A set of values ​​enclosed in square brackets
• Object: A set of key-value pairs enclosed in curly braces

Processing JSON data in PHP

PHP provides a large number of functions to Process JSON data. The following are the most commonly used functions:

• json_encode(): Encode PHP variables into JSON strings
• json_decode(): Decode JSON string into PHP variable

Practical case

Encode PHP array into JSON string

<?php
$data = array('name' => 'John Doe', 'age' => 30);
$json = json_encode($data);
echo $json; // 输出：{"name":"John Doe","age":30}
?>

Decode JSON strings into PHP variables

<?php
$json = '{"name":"John Doe","age":30}';
$data = json_decode($json);
var_dump($data); // 输出：object(stdClass)#1 (2) { ["name"] => string(7) "John Doe" ["age"] => int(30) }
?>

Use decodedata to configure decoding options

<?php
$json = '{"name":"John Doe","age":30}';
$data = json_decode($json, true); // 启用 assoc 参数
var_dump($data); // 输出：array(2) { ["name"] => string(7) "John Doe" ["age"] => int(30) }
?>

Handle nested data structures

JSON can represent complex data structures such as nested objects and arrays. PHP allows you to use recursive methods to handle these structures.

<?php
$json = '{
  "name": "John Doe",
  "address": {
    "street": "123 Main Street",
    "city": "Anytown"
  }
}';
$data = json_decode($json, true);
echo "Name: " . $data['name'] . PHP_EOL; // 输出：Name: John Doe
echo "Street: " . $data['address']['street'] . PHP_EOL; // 输出：Street: 123 Main Street
?>

Using the powerful JSON processing capabilities in PHP, you can easily exchange and store data, greatly simplifying your web applications.

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