Fb Output Compression - Hhvm

:::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. :::

Toggles the compression status of HipHop output, if headers have already been sent this may be ignored

Hack

function fb_output_compression(
  bool $new_value,
): bool;

Parameters

bool $new_value - The new value for the compression state.

Returns

bool - - The old value.