cache.php

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<?php
function elgg_save_system_cache(string $type, $data, int $expire_after = null): bool {
    return _elgg_services()->systemCache->save($type, $data, $expire_after);
}

function elgg_load_system_cache(string $type) {
    return _elgg_services()->systemCache->load($type);
}

function elgg_delete_system_cache(string $type): bool {
    return _elgg_services()->systemCache->delete($type);
}

/* Simplecache */

function elgg_register_simplecache_view(string $view_name): void {
    _elgg_services()->simpleCache->registerCacheableView($view_name);
}

function elgg_get_simplecache_url(string $view): string {
    return _elgg_services()->simpleCache->getUrl($view);
}

function elgg_invalidate_caches(): void {
    // this event sequence could take while, make sure there is no timeout
    set_time_limit(0);
    
    _elgg_services()->config->save('lastcache', time());
    
    _elgg_services()->events->triggerSequence('cache:invalidate', 'system');
}

function elgg_clear_caches(): void {
    // this event sequence could take while, make sure there is no timeout
    set_time_limit(0);
    
    _elgg_services()->events->triggerSequence('cache:clear', 'system');
}

function elgg_purge_caches(): void {
    // this event sequence could take while, make sure there is no timeout
    set_time_limit(0);
    
    _elgg_services()->events->triggerSequence('cache:purge', 'system');
}