sites.php

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<?php
function elgg_get_site_entity($site_guid = 0) {
    global $CONFIG;

    $result = false;

    if ($site_guid == 0) {
        $site = $CONFIG->site;
    } else {
        $site = get_entity($site_guid);
    }

    if ($site instanceof ElggSite) {
        $result = $site;
    }

    return $result;
}

function get_site_entity_as_row($guid) {
    global $CONFIG;

    $guid = (int)$guid;
    return get_data_row("SELECT * FROM {$CONFIG->dbprefix}sites_entity WHERE guid = $guid");
}

function get_site_by_url($url) {
    global $CONFIG;

    $url = sanitise_string($url);

    $row = get_data_row("SELECT * from {$CONFIG->dbprefix}sites_entity where url='$url'");

    if ($row) {
        return get_entity($row->guid);
    }

    return false;
}

function _elgg_sites_test($hook, $type, $value, $params) {
    global $CONFIG;
    $value[] = "{$CONFIG->path}engine/tests/ElggSiteTest.php";
    return $value;
}

elgg_register_plugin_hook_handler('unit_test', 'system', '_elgg_sites_test');