Array Fill Keys

:::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. :::

Fills an array with the value of the value parameter, using the values of the keys array as keys

function array_fill_keys<Tk as arraykey, Tv>(
  mixed $keys,
  mixed $value,
): darray<arraykey, mixed, Tk, Tv>;

Parameters

• mixed $keys - Array of values that will be used as keys. Illegal values for key will be converted to string.
• mixed $value - Value to use for filling

Returns

• mixed - - Returns the filled array