Str To Numeric

:::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. :::

namespace HH;

function str_to_numeric(
  string $str,
): ?num;

Parameters

• string $str - The input string

Returns

• ?num - - If $str is not "numeric" as per the definition of str_number_coercible null is returned. Otherwise, return the value of the string coerced to a number