__construct

:::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. :::

Create a new interval timer

public function __construct(
  double $interval,
  float $initial,
  mixed $callback,
);

Parameters

• double $interval - frequency in seconds of timer interrupts.
• float $initial
• mixed $callback