How to read and write JSON files in PHP?

In PHP, you can use the json_encode() and json_decode() functions to read and write JSON files. Here's an example of how to do it:

Reading JSON File: To read JSON data from a file, you first need to use the file_get_contents() function to read the file contents into a string. Then, you can use json_decode() function to convert that string into a PHP array or object.

// Read JSON file
$jsonString = file_get_contents('data.json');
$data = json_decode($jsonString, true); // true parameter converts JSON to associative array

// Access the data
echo $data['name'];
echo $data['age'];

Writing JSON File: To write data to a JSON file, you can use the json_encode() function to convert the PHP array or object into a JSON string, and then use the file_put_contents() function to write that string to a file.

// Create data to be written
$data = array(
    'name' => 'John Doe',
    'age' => 30
);

// Convert data to JSON string
$jsonString = json_encode($data);

// Write JSON string to file
file_put_contents('data.json', $jsonString);

Remember to replace 'data.json' with your file path.

Note that when using json_decode(), the second parameter determines if the resulting data will be converted to an associative array or an object. Using true makes it an associative array, while omitting it or using false makes it an object.