如何从php发送的ajax中接收和使用json？

$.ajax({
    url: 'example.php',
    type: 'POST',
    dataType: 'json',
    data: {param1: 'value1', param2: 'value2'},
    success: function(response) {
        // 处理返回的JSON数据
        console.log(response);
    },
    error: function(xhr, status, error) {
        // 处理错误
        console.log(error);
    }
});

$param1 = $_POST['param1'];
$param2 = $_POST['param2'];

// 处理数据并生成要返回的JSON数据
$response = array('result' => 'success', 'message' => 'Data received and processed.');

// 将数据以JSON格式返回给前端
header('Content-Type: application/json');
echo json_encode($response);