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<?php
class MySimpleSocketClient {
protected $sock;
public function __construct(string $host, int $port)
{
if (($socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false)
throw new Exception("socket_create() failed: ".$this->getSocketError());
$this->sock = $socket;
if ((socket_connect($socket, $host, $port)) === false)
throw new Exception("socket_connect() failed: ".$this->getSocketError());
}
public function __destruct()
{
$this->close();
}
/**
* @throws Exception
*/
public function send(string $data)
{
$data .= "\r\n";
$remained = strlen($data);
while ($remained > 0) {
$result = socket_write($this->sock, $data);
if ($result === false)
throw new Exception(__METHOD__ . ": socket_write() failed: ".$this->getSocketError());
$remained -= $result;
if ($remained > 0)
$data = substr($data, $result);
}
}
/**
* @throws Exception
*/
public function recv()
{
$recv_buf = '';
$buf = '';
while (true) {
$result = socket_recv($this->sock, $recv_buf, 1024, 0);
if ($result === false)
throw new Exception(__METHOD__ . ": socket_recv() failed: " . $this->getSocketError());
// peer disconnected
if ($result === 0)
break;
$buf .= $recv_buf;
if (endsWith($buf, "\r\n"))
break;
}
return trim($buf);
}
/**
* Close connection.
*/
public function close()
{
if (!$this->sock)
return;
socket_close($this->sock);
$this->sock = null;
}
/**
* @return string
*/
protected function getSocketError(): string
{
$sle_args = [];
if ($this->sock !== null)
$sle_args[] = $this->sock;
return socket_strerror(socket_last_error(...$sle_args));
}
}
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