How to convert php array to json

In PHP programming, array is a very important data type. It can store multiple data items, and array elements can be dynamically added or deleted while the program is running. JSON (JavaScript Object Notation) is a lightweight data exchange format that is widely used in Web applications because of its simplicity and ease of reading, such as front-end and back-end API data transfer, data storage, data communication, etc. .

Converting PHP arrays to JSON data format is a common task in writing web applications. This article will discuss how to convert PHP array to JSON data format using PHP built-in functions.

1. Use json_encode() function to convert PHP array to JSON data

PHP provides a json_encode() function, which can be used to easily convert PHP array to JSON format data. Here is an example:

<?php
// 创建一个PHP数组
$person = array(
    'name' => 'John',
    'age' => 30,
    'city' => 'New York'
);

// 将PHP数组转换为JSON格式数据
$json_str = json_encode($person);

// 输出JSON格式数据
echo $json_str;
?>

In the above code example, we first create a PHP array containing three properties. We then use the json_encode() function to convert this array into JSON formatted data and save it in a variable. Finally, we use the echo statement to output the value of the variable, which is data in JSON format.

When we run the above PHP script, the following results will be output:

{"name":"John","age":30,"city":"New York"}

As can be seen from the above results, the data in JSON format has been successfully generated and included in the PHP array all data items.

2. Use the JSON_PRETTY_PRINT option to format and output JSON format data

The JSON format data generated in the above example is output as a single-line string, which is not easy to read. . If you want to format this JSON data when outputting, you can add a JSON_PRETTY_PRINT option when using the json_encode() function. Here is an example:

<?php
// 创建一个PHP数组
$person = array(
    'name' => 'John',
    'age' => 30,
    'city' => 'New York'
);

// 将PHP数组转换为JSON格式数据
$json_str = json_encode($person, JSON_PRETTY_PRINT);

// 输出JSON格式数据
echo $json_str;
?>

In the above code example, we used the JSON_PRETTY_PRINT option in the json_encode() function. This option will format the JSON format data on output to make it easier to read.

When we run the above PHP script, the following results will be output:

{
    "name": "John",
    "age": 30,
    "city": "New York"
}

As can be seen from the above results, the JSON format data has been formatted and output, and each data item has Occupies a separate line for easy reading and understanding.

Summary

In web applications, it is often necessary to convert data from one format to another. PHP array is a common data type, and JSON format data is also a common data format. Fortunately, PHP provides a convenient function (json_encode()) that can easily convert PHP arrays into JSON format data. If you need to format and output this data, you only need to add a JSON_PRETTY_PRINT option when using the json_encode() function. By using the above methods, we can process data more easily when developing web applications, and improve the readability and maintainability of the program.

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