Source of maps.inc.php - Zabbix

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         * If user has no rights to see the details of particular selement, add only info that is needed to render map
         * icons.
         */
        if (PERM_READ > $selement['permission']) {
            $info[$selementid] = getSelementInfo($selement_info + ['iconid_off' => $selement['iconid_off']]);
​
            continue;
        }
​
        $host_count = count($selement['hosts']);
​
        if ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_TRIGGER
                || $selement['elementtype'] == SYSMAP_ELEMENT_TYPE_MAP) {
            $trigger_hosts = [];
            foreach ($selement['triggers'] as $trigger) {
                foreach ($trigger['hosts'] as $host) {
                    if (!array_key_exists($host['hostid'], $trigger_hosts)
                            && !array_key_exists($host['hostid'], $selement['hosts'])) {
                        $trigger_hosts[$host['hostid']] = true;
                        $host_count++;
​
                        if ($host['status'] == HOST_STATUS_MONITORED
                                && $host['maintenance_status'] == HOST_MAINTENANCE_STATUS_ON
                                && ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_TRIGGER
                                    || ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_MAP
                                        && array_key_exists(SYSMAP_ELEMENT_TYPE_TRIGGER, $trigger['source'])))) {
                            $selement_info['maintenance']++;
                        }
                    }
                }
            }
        }
        $trigger_hosts = [];
        $selement_info['maintenance'] = getTriggerMaintenance($selement, $selement_info, $sysmaps_data, $trigger_hosts);
​
        foreach ($selement['hosts'] as $hostid) {
            $host = $hosts[$hostid];
​
            if ($host['status'] == HOST_STATUS_NOT_MONITORED) {
                $selement_info['disabled']++;
            }
            elseif ($host['maintenance_status'] == HOST_MAINTENANCE_STATUS_ON) {
                $selement_info['maintenance']++;
            }
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                $info[$selement['selementid']]['name'] = array_key_exists($hostid, $hosts)
                    ? $hosts[$hostid]['name']
                    : [];
            }
        }
    }
​
    return $info;
}
​
function getElementHosts($selement, $sysmaps_data, $hosts_by_groupids) {
function getTriggerMaintenance($selement, $selement_info, $sysmaps_data, &$trigger_hosts): int {
    if ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_TRIGGER) {
        foreach ($selement['triggers'] as $trigger) {
            foreach ($trigger['hosts'] as $host) {
                if (!array_key_exists($host['hostid'], $trigger_hosts)
                        && !array_key_exists($host['hostid'], $selement['hosts'])
                        && $host['status'] == HOST_STATUS_MONITORED
                        && $host['maintenance_status'] == HOST_MAINTENANCE_STATUS_ON) {
                    $selement_info['maintenance']++;
                }
​
                $trigger_hosts[$host['hostid']] = true;
            }
        }
    }
    elseif ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_MAP) {
        $sysmapid = $selement['elements'][0]['sysmapid'];
​
        if (array_key_exists($sysmapid, $sysmaps_data)) {
            foreach ($sysmaps_data[$sysmapid]['selements'] as $nested_element) {
                foreach ($nested_element['hosts'] as $key => $host) {
                    $trigger_hosts[$key] = true;
                }
​
                $selement_info['maintenance'] = getTriggerMaintenance($nested_element, $selement_info, $sysmaps_data,
                    $trigger_hosts
                );
            }
        }
    }
​
    return $selement_info['maintenance'];
}
​
function getElementHosts($selement, $sysmaps_data, $hosts_by_groupids): array {
    $host_ids = [];
​
    if ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_HOST) {
        $hostid = $selement['elements'][0]['hostid'];
        $host_ids[$hostid] = $hostid;
    }
    elseif ($selement['elementtype'] == SYSMAP_ELEMENT_TYPE_HOST_GROUP) {
        $groupid = $selement['elements'][0]['groupid'];
        $host_ids = $hosts_by_groupids[$groupid];
    }