C

:::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. :::

:::warning Deprecated: Use Locale\bytes() instead. :::

namespace HH\Lib\Locale;

function c(): Locale;

This function is being removed as:

• there is often confusion between "the C locale" and "the current libc locale"
• HHVM implements optimizations which are a visible behavior change; for example, strlen("foo\0bar") is 7 in HHVM, but 3 in libc.

Returns

• Locale