Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc5.php

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<?php
require __DIR__ . '/../vendor/autoload.php';
use PHPModbus\ModbusMasterUdp;
require_once __DIR__ . '/request_input_data.php'; // 'ip', 'unitid','reference','quantity' are read from $_GET
$value = isset($_GET['value']) ? ((bool)$_GET['value']) : false;
$modbus = new ModbusMasterUdp($ip);
try {
// Write single coil - FC5
$recData = $modbus->writeSingleCoil($unitId, $reference, [$value]);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
echo '<h1>Status</h1><pre>';
print_r($modbus);
echo '</pre>';
echo '<h1>Data</h1><pre>';
print_r($recData);
echo '</pre>';