hphp_clear_unflushed

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.

Clears any output contents that have not been flushed to networked

function hphp_clear_unflushed(): void;

This is useful when handling a fatal error. Before displaying a customized PHP page, one may call this function to clear previously written content, so to replay what will be displayed.

Returns

• void