How to set JSON formatting code in PHP

PHP is a very popular programming language that is widely used in web development. In PHP, JSON formatting is a very important technology that can help developers handle various data types conveniently. In this article, we will introduce how to set up JSON formatting code in PHP.

1. Understanding JSON

First of all, we need to understand the JSON data format. JSON (JavaScript Object Notation) is a lightweight data exchange format based on JavaScript's syntax and easy for humans to read and write. Data in JSON format consists of key-value pairs, which can represent various complex data structures.

The following is an example of data in JSON format:

{
   "name": "John Smith",
   "age": 28,
   "address": {
      "city": "New York",
      "state": "NY"
   },
   "phoneNumbers": [
      {
         "type": "home",
         "number": "555-1234"
      },
      {
         "type": "work",
         "number": "555-5678"
      }
   ]
}

In PHP, we can use the built-in function to convert JSON format data into a PHP array, or convert a PHP array into Data in JSON format.

2. Set JSON formatting code

In PHP, use the json_encode() function to convert a PHP array into JSON format data. If no parameters are set, the function will return a plain JSON string. We can use the second parameter of the json_encode() function to set the flags of the JSON output format, including indentation and newlines, etc. Here are some commonly used JSON output format flags:

• JSON_PRETTY_PRINT: Prints JSON data in an easy-to-read format, including indentation and newlines.
• JSON_UNESCAPED_UNICODE: Disable escaping Unicode characters into formats like "\uXXXX". This option is useful when we need to include non-ASCII characters in the output JSON data.
• JSON_UNESCAPED_SLASHES: Disable escaping slash characters into "/" format. This option reduces the number of characters output.
• JSON_FORCE_OBJECT: Force the conversion of PHP arrays into JSON objects. If this option is not added, when the PHP array contains only numerically indexed values, the json_encode() function will convert it to a JSON array.

The following is an example of using the json_encode() function to output JSON format data:

$data = array(
    'name' => 'John Smith',
    'age' => 28,
    'address' => array(
        'city' => 'New York',
        'state' => 'NY'
    ),
    'phoneNumbers' => array(
        array(
            'type' => 'home',
            'number' => '555-1234'
        ),
        array(
            'type' => 'work',
            'number' => '555-5678'
        )
    )
);

echo json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_FORCE_OBJECT);

The output result is:

{
    "name": "John Smith",
    "age": 28,
    "address": {
        "city": "New York",
        "state": "NY"
    },
    "phoneNumbers": [
        {
            "type": "home",
            "number": "555-1234"
        },
        {
            "type": "work",
            "number": "555-5678"
        }
    ]
}

You can see that in the output result JSON data has been formatted in a highly readable format.

3. Summary

In this article, we introduced how to format JSON output in PHP. By setting the second parameter of the json_encode() function, we can easily control the output format of JSON data. Using these options we can generate data in JSON format that is easy to read and maintain.

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