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Increment

hphp/hack/manual/hsl/Functions/HH.Lib.Legacy_FIXME/increment.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. :::

Does the PHP style behaviour when doing an inc/dec operation

Hack
namespace HH\Lib\Legacy_FIXME;

function increment(
  mixed $value,
): dynamic;

Specially handles

  1. incrementing null
  2. inc/dec on empty and numeric strings

Parameters

  • mixed $value

Returns

  • dynamic
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