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string

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.

Returns a securely generated random string of length $length

namespace HH\Lib\SecureRandom;

function string(
  int $length,
  ?string $alphabet = NULL,
): string;

The string is composed of characters from $alphabet if $alphabet is specified.

For pseudorandom strings, see PseudoRandom\string.

Parameters​

  • int $length
  • ?string $alphabet = NULL

Returns​

  • string