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fb_set_exit_callback

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

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