Lz4 Compress

:::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. :::

This function compresses the given string using the lz4lib data format, which is primarily used for compressing and uncompressing memcache values

function lz4_compress(
  string $uncompressed,
  bool $high = false,
): mixed;

Parameters

• string $uncompressed - The uncompressed data
• bool $high = false

Returns

• string - - The compressed data, or FALSE on error