Is Empty

:::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. :::

Returns true if $string is null or the empty string

namespace HH\Lib\Str;

function is_empty(
  ?string $string,
): bool;

Returns false otherwise.

Guide

• String

Parameters

• ?string $string

Returns

• bool