function initGlobalVariables()
{
global $users, $usersInRestaurants, $dapulseApiKey, $numOfResults, $usersTimeInRest, $invited, $replies, $orders, $testCount;
if (!$dapulseApiKey) {
$dapulseApiKey = 'c83b648d198b0a081b71c612c871470d';
}
if (!$numOfResults) {
$numOfResults = 2000;
}
if (!($users = getGlobalVar('users'))) {
$users = createUsersIndex();
setGlobalVar('users', $users);
}
if (!($usersInRestaurants = getGlobalVar('usersInRestaurants'))) {
$usersInRestaurants = [];
setGlobalVar('usersInRestaurants', $usersInRestaurants);
}
if (!($usersTimeInRest = getGlobalVar('usersTimeInRest'))) {
$usersTimeInRest = [];
setGlobalVar('usersTimeInRest', $usersTimeInRest);
}
if (!$invited) {
$invited = [];
setGlobalVar('invites', $invited);
}
if (!$replies) {
$replies = [];
setGlobalVar('replies', $replies);
}
if (!$orders) {
$orders = [];
setGlobalVar('orders', $orders);
}
if (!$testCount) {
$testCount = 0;
setGlobalVar('testCount', $testCount);
}
}
function updateMinMaxWifiSignals($signal, $group, $conn)
{
$wifi_sig_low = getGlobalVar("wifi_sig_low", $group, $conn);
$wifi_sig_high = getGlobalVar("wifi_sig_high", $group, $conn);
//if it is less than min, update the min
if ($signal < $wifi_sig_low) {
//update the min
setGlobalVar("wifi_sig_low", $group, $signal, $conn);
return "low";
}
//elseif it is more than the max
if ($signal > $wifi_sig_high) {
//update the max
setGlobalVar("wifi_sig_high", $group, $signal, $conn);
return "high";
}
$difference = abs($wifi_sig_high - $wifi_sig_low);
$difference_slots = $difference / 3;
if ($signal <= $wifi_sig_low + $difference_slots) {
return "low";
}
if ($signal >= $wifi_sig_low + $difference_slots && $signal < $wifi_sig_low + 2 * $difference_slots) {
return "med";
}
if ($signal >= $wifi_sig_low + 2 * $difference_slots) {
return "high";
} else {
//is not in any region. so just say "low";
return "med";
}
}