connect_async

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Connect to a socket asynchronously, returning a non-disposable handle

namespace HH\Lib\TCP;

function connect_async(
  string $host,
  int $port,
  ConnectOptions $opts = dict [
],
): Awaitable<CloseableSocket>;

If using IPv6 with a fallback to IPv4 with a connection timeout, the timeout will apply separately to the IPv4 and IPv6 connection attempts.

Parameters

• string $host
• int $port
• ConnectOptions $opts = dict [ ]

Returns

• Awaitable<CloseableSocket>