Application of PHP functions in JSON processing

There are two main functions used to process JSON data in PHP: json_encode() is used to encode PHP data into a JSON string. json_decode() is used to decode a JSON string into a PHP data structure.

Application of PHP functions in JSON processing

JSON (JavaScript Object Notation) is a method used in servers and Web A lightweight data format for exchanging data between applications. PHP provides various functions to process JSON data.

Encoding JSON data

To encode the PHP data structure into a JSON string, you can use the json_encode() function:

$data = [
    'name' => 'John Doe',
    'age' => 30
];

$json = json_encode($data);

Decoding JSON data

To decode a JSON string into a PHP data structure you can use json_decode() Function:

$json = '{"name":"John Doe","age":30}';

$data = json_decode($json, true);

Note: true Parameters decode the JSON object into an array. To decode a JSON string into an object, replace the true parameter with false.

Practical case

Use AJAX to obtain JSON data:

// ajax_data.php
$data = [
    'name' => 'John Doe',
    'age' => 30
];

echo json_encode($data);

// main.js
fetch('ajax_data.php')
  .then(response => response.json())
  .then(data => {
    console.log(data);
  });

Use JSON to validate the form data:

if (isset($_POST['submit'])) {
    $data = json_decode(file_get_contents('php://input'), true);

    // 验证数据 ...
}

Other useful JSON functions

• json_last_error(): Get the error code of the last JSON operation.
• json_last_error_msg(): Get the error description of the last JSON operation.
• json_pretty_print(): Format JSON output into human-readable form.

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