Very (very) simple telnet clone written in PHP

telnet.php

<?php

$serverSocket = stream_socket_client('tcp://' . $argv[1] . ':' . $argv[2]);

$read = array(STDIN);
$write = $except = array();
$request = $response = '';

$run = true;

echo '> ';

while ($run === true)
{
	stream_select($read, $write, $except, null);

	$cWrite = $write;
	$write = array();

	$cRead = $read;
	$read = array();

	if (isset($cWrite[0]) === true)
	{
		$request = (string) substr($request, fwrite($serverSocket, $request));

		if ($request != '')
		{
			$write[0] = $serverSocket;
		}
		else
		{
			$response = '';
			$read[1] = $serverSocket;
		}
	}

	switch (true)
	{
		case isset($cRead[0]):
			$input = fread($cRead[0], 2048);

			while (substr($input, - strlen(PHP_EOL)) !== PHP_EOL)
			{
				$input .= fread($cRead[0], 2048);
			}

			$input = trim($input);

			$run = (strtolower($input) != 'quit');

			if ($run === true)
			{
				$request = $input . "\r\n";
				$write[0] = $serverSocket;
			}
			break;

		case isset($cRead[1]):
			$data = fread($cRead[1], 2048);

			if ($data == '')
			{
				echo 'Connection closed!' . PHP_EOL;

				$run = false;
			}
			else
			{
				$response .= $data;

				if (substr($response, -2) === "\r\n")
				{
					echo trim($response) . PHP_EOL;

					echo '> ';
					$read[0] = STDIN;
				}
				else
				{
					$read[1] = $cRead[1];
				}
			}
			break;
	}
}

echo 'Bye!' . PHP_EOL;