Fb Set Exit Callback - 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. :::

Set a callback function that is called when php tries to exit

Hack

function fb_set_exit_callback(
  mixed $function,
): void;

Parameters

mixed $function - The callback to invoke. An exception object will be passed to the function

Returns

void