Apc Size

:::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. :::

Find the in-memory size of a key in APC, for debugging purposes

function apc_size(
  string $key,
): ?int;

Parameters

• string $key - The key to find the size of.

Returns

• mixed - - Returns the current size of a key or null on failure.