allow int message id

update response format

The code provided is a PHP script that establishes a WebSocket connec…

…tion to a server using the WebSocket Protocol. The WebSocket Protocol allows for bidirectional, real-time communication between a client and a server over the web.

Here are some key aspects of the code:

1. **Establishing Connection**: The script establishes a WebSocket connection by calling the `onHandshake` method on the `$client` object. This method is called when the client's browser sends a handshake request to the server, which contains the client's WebSocket protocol version.

2. **Handling Incoming Messages**: The script handles incoming messages from the server using the `onText` method, which is called whenever a text message is received from the server. If a non-text message (e.g., binary data) is received, it uses the `onBinary` method instead.

3. **Sending Messages**: When a message is received from the client and needs to be sent back to the server, it is encoded as JSON and then written to the connection using the `$connection->write()` method.

4. **Error Handling**: The script handles errors that occur during the WebSocket handshake or while sending/receiving messages using the `onClose` method, which is called when a connection is closed due to an error. It also uses the `onError` method, which is called whenever an error occurs on the connection.

5. **Connection Lifecycle Events**: The script handles various lifecycle events for the WebSocket connection, such as connection opening (`onOpen`), connection closing (`onClose`), and disconnection errors that occur during the handshake process (`onClose`).

Here are some potential improvements:

1. **Error Handling**: Although error handling is present in the code, it might be more informative to provide details about the specific error that occurred.

2. **Security**: It's a good practice to check for server authentication credentials or require a token before establishing the WebSocket connection.

3. **Connection Timeout**: If no data has been sent/received within a specified time period (connection timeout), it could lead to a disconnection, which should be handled accordingly in your application logic.

4. **Code Structure**: The script includes multiple `on*` methods that handle specific events during the WebSocket connection lifecycle. It would be beneficial to extract these into separate functions or classes for better organization and reusability.