configuration.php

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<?php
use Elgg\Filesystem\Directory;

function elgg_get_site_url($site_guid = 0) {
    return _elgg_services()->config->getSiteUrl($site_guid);
}

function elgg_get_plugins_path() {
    return _elgg_services()->config->getPluginsPath();
}

function elgg_get_data_path() {
    return _elgg_services()->config->getDataPath();
}

function elgg_get_cache_path() {
    return _elgg_services()->config->getCachePath();
}

function elgg_get_root_path() {
    return Directory\Local::root()->getPath('/');
}

function elgg_get_engine_path() {
    return dirname(__DIR__);
}

function elgg_get_config($name, $site_guid = 0) {
    if ($name === 'siteemail') {
        $msg = 'The config value "siteemail" is deprecated. Use elgg_get_site_entity()->email';
        elgg_deprecated_notice($msg, '2.1');
    } else if ($name == 'icon_sizes') {
        $msg = 'The config value "icon_sizes" is deprecated. Use elgg_get_icon_sizes()';
        elgg_deprecated_notice($msg, '2.2');
    }

    return _elgg_services()->config->get($name, $site_guid);
}

function elgg_set_config($name, $value) {
    return _elgg_services()->config->set($name, $value);
}

function elgg_save_config($name, $value, $site_guid = 0) {
    return _elgg_services()->config->save($name, $value, $site_guid);
}

function datalist_get($name) {
    return _elgg_services()->datalist->get($name);
}

function datalist_set($name, $value) {
    return _elgg_services()->datalist->set($name, $value);
}

function run_function_once($functionname, $timelastupdatedcheck = 0) {
    return _elgg_services()->datalist->runFunctionOnce($functionname, $timelastupdatedcheck);
}

function unset_config($name, $site_guid = 0) {
    return _elgg_services()->configTable->remove($name, $site_guid);
}

function set_config($name, $value, $site_guid = 0) {
    return _elgg_services()->configTable->set($name, $value, $site_guid);
}

function get_config($name, $site_guid = 0) {
    return _elgg_services()->configTable->get($name, $site_guid);
}

function _elgg_config_test($hook, $type, $tests) {
    $tests[] = \Elgg\Application::elggDir()->getPath("engine/tests/ElggCoreConfigTest.php");
    return $tests;
}

function elgg_get_icon_sizes($entity_type = null, $entity_subtype = null, $type = 'icon') {
    return _elgg_services()->iconService->getSizes($entity_type, $entity_subtype, $type);
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $hooks->registerHandler('unit_test', 'system', '_elgg_config_test');
};