How to convert PHP array to JSON gracefully

In PHP, you can convert an array to JSON format using the json_encode() function, which accepts an array and returns a JSON string. It supports several options, including JSON_FORCE_OBJECT (forces arrays to be encoded as objects), JSON_NUMERIC_CHECK (keeps numeric key-value pairs as numeric values), JSON_UNESCAPED_SLASHES (disables forward slash escaping), and JSON_UNESCAPED_UNICODE (disables Unicode character escaping). JSON data can be sent to the server via AJAX and then parsed back into a PHP array using the json_decode() function.

Elegantly convert PHP array to JSON

In PHP, converting an array to JSON format is very easy, just Use the json_encode() function. This function accepts an array as input and returns a JSON encoded string. For example:

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

$json = json_encode($array);

echo $json; // 输出: {"name":"John Doe","age":30}

Learn more

json_encode() The function also supports some useful options that allow you to control the JSON format of the output. Some of the options include:

• JSON_FORCE_OBJECT: Forces the array to be encoded as an object, even if the array is a simple list of key-value pairs.
• JSON_NUMERIC_CHECK: Ensures that numeric key-value pairs remain as numeric values ​​after encoding, not strings.
• JSON_UNESCAPED_SLASHES: Disables backslash forwarding, meaning forward slashes are not escaped in the output JSON.
• JSON_UNESCAPED_UNICODE: Disables escaping of Unicode characters, meaning they will appear as plain text in the output JSON.

Practical Case

Suppose we have an array that contains information about users stored in a database. We want to convert this array to JSON format to send to the server via AJAX request.

$user = [
    'id' => 1,
    'name' => 'John Doe',
    'email' => 'john.doe@example.com'
];

$json = json_encode($user);

We can use AJAX to send $json variables as data as follows:

$.ajax({
  url: 'save_user.php',
  type: 'POST',
  data: { user: json },
  success: function(response) {
    // 操作服务器响应
  }
});

On the server side, we can use json_decode() Function to parse JSON string back into PHP array:

<?php
$json = $_POST['user'];
$user = json_decode($json, true); // 第二个参数为 true 将结果作为关联数组而不是对象返回

// 对 $user 数组进行操作...
?>

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