What are common differences in data transmission between PERL and PHP when using sockets?

When using sockets for data transmission, one common difference between PERL and PHP is the way data is encoded and decoded. PERL uses its own serialization methods, while PHP typically uses JSON or XML for data interchange. To ensure compatibility between the two languages, it is important to agree on a common data format for transmission.

// PHP code snippet using JSON for data transmission
$data = array('key1' => 'value1', 'key2' => 'value2');
$json_data = json_encode($data);

// Send data over socket
socket_write($socket, $json_data, strlen($json_data));

// Receive data from socket
$response = socket_read($socket, 1024);
$response_data = json_decode($response, true);