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<?php
namespace MediaWiki\Cache\Hook;
/**
* This is a hook handler interface, see docs/Hooks.md.
* Use the hook name "MessageCacheFetchOverrides" to register handlers implementing this interface.
*
* @stable to implement
* @ingroup Hooks
*/
interface MessageCacheFetchOverridesHook {
/**
* This hook is called to fetch overrides. Use this hook to override message keys
* for customisations. Returned messages key must be formatted with:
* 1) the first letter in lower case according to the content language
* 2) spaces replaced with underscores
*
* @since 1.41
*
* @param (string|callable)[] &$keys Message keys mapped to their override. Values may also be a
* callable that returns a message key. Callables are passed the message key,
* the MessageCache instance, a Language/StubUserLang object and a boolean indicating if the
* value should be fetched from the database. Note that strings will always be interpreted as
* a message key; this is not valid callable syntax! This prevents ambiguity between message keys and functions.
* Use Closure::fromCallable or another valid callable syntax.
*/
public function onMessageCacheFetchOverrides( array &$keys ): void;
}
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