Open Write Only

:::info[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. :::

namespace HH\Lib\File;

function open_write_only(
  string $path,
  WriteMode $mode = WriteMode::OPEN_OR_CREATE,
  int $create_file_permissions = 420,
): CloseableWriteHandle;

Parameters

• string $path
• WriteMode $mode = WriteMode::OPEN_OR_CREATE
• int $create_file_permissions = 420

Returns

• CloseableWriteHandle