Fb Compact Unserialize

:::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. :::

Unserialize a previously fb_compact_serialize()-ed data

function fb_compact_unserialize(
  mixed $thing,
  inout mixed $success,
  inout mixed $errcode,
): mixed;

Parameters

• mixed $thing - What to unserialize.
• inout mixed $success - Whether it was successful or not.
• inout mixed $errcode - One of those FB_UNSERIALIZE_ constants to describe what the decoding error was, if it failed.

Returns

• mixed - - Unserialized data.