What is the difference between passing an array and an object as parameters in JSON encoding in PHP?

When passing an array as a parameter in JSON encoding in PHP, you need to use the `json_encode()` function to convert the array into a JSON string. On the other hand, when passing an object as a parameter, you can directly encode the object using `json_encode()` as PHP treats objects as associative arrays. However, it's important to note that when encoding objects, only public properties will be included in the JSON output.

// Passing an array as a parameter
$array = ['key1' => 'value1', 'key2' => 'value2'];
$json_array = json_encode($array);

// Passing an object as a parameter
class MyClass {
    public $key1 = 'value1';
    public $key2 = 'value2';
}

$obj = new MyClass();
$json_obj = json_encode($obj);