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Register Shutdown Function

hphp/hack/manual/apis/Functions/register_shutdown_function.md

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:::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. :::

Register a function for execution on shutdown

Hack
function register_shutdown_function<T>(
  (function(): T) $function,
): void;

Parameters

  • (function(): T) $function

Returns

  • void
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