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apc_size

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.