require_once 'Tinkerforge/IPConnection.php';
require_once 'Tinkerforge/BrickletUVLight.php';
use Tinkerforge\IPConnection;
use Tinkerforge\BrickletUVLight;
const HOST = 'localhost';
const PORT = 4223;
const UID = 'XYZ';
// Change XYZ to the UID of your UV Light Bricklet
// Callback function for UV light reached callback (parameter has unit µW/cm²)
function cb_uvLightReached($uv_light)
{
    echo "UV Light: {$uv_light} µW/cm²\n";
    echo "UV Index > 3. Use sunscreen!\n";
}
$ipcon = new IPConnection();
// Create IP connection
$uvl = new BrickletUVLight(UID, $ipcon);
// Create device object
$ipcon->connect(HOST, PORT);
// Connect to brickd
// Don't use device before ipcon is connected
// Get threshold callbacks with a debounce time of 10 seconds (10000ms)
$uvl->setDebouncePeriod(10000);
// Register UV light reached callback to function cb_uvLightReached
$uvl->registerCallback(BrickletUVLight::CALLBACK_UV_LIGHT_REACHED, 'cb_uvLightReached');
// Configure threshold for UV light "greater than 750 µW/cm²" (unit is µW/cm²)
$uvl->setUVLightCallbackThreshold('>', 750, 0);
echo "Press ctrl+c to exit\n";
$ipcon->dispatchCallbacks(-1);
// Dispatch callbacks forever
<?php

require_once 'Tinkerforge/IPConnection.php';
require_once 'Tinkerforge/BrickletUVLight.php';
use Tinkerforge\IPConnection;
use Tinkerforge\BrickletUVLight;
const HOST = 'localhost';
const PORT = 4223;
const UID = 'XYZ';
// Change XYZ to the UID of your UV Light Bricklet
// Callback function for UV light callback (parameter has unit µW/cm²)
function cb_uvLight($uv_light)
{
    echo "UV Light: {$uv_light} µW/cm²\n";
}
$ipcon = new IPConnection();
// Create IP connection
$uvl = new BrickletUVLight(UID, $ipcon);
// Create device object
$ipcon->connect(HOST, PORT);
// Connect to brickd
// Don't use device before ipcon is connected
// Register UV light callback to function cb_uvLight
$uvl->registerCallback(BrickletUVLight::CALLBACK_UV_LIGHT, 'cb_uvLight');
// Set period for UV light callback to 1s (1000ms)
// Note: The UV light callback is only called every second
//       if the UV light has changed since the last call!
$uvl->setUVLightCallbackPeriod(1000);
echo "Press ctrl+c to exit\n";
$ipcon->dispatchCallbacks(-1);
// Dispatch callbacks forever