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
use PHPModbus\ModbusMasterUdp;
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$ip = filter_var($_GET['ip'], FILTER_VALIDATE_IP) ? $_GET['ip'] : '192.192.15.51';
$unitId = ((int)$_GET['unitid']) ?: 0;
$reference = ((int)$_GET['reference']) ?: 12288;
$value = ((bool)$_GET['value']) ?: false;
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$modbus = new ModbusMasterUdp($ip);
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try {
// Write single coil - FC5
$recData = $modbus->writeSingleCoil($unitId, $reference, [$value]);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
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}
echo '<h1>Status</h1><pre>';
print_r($modbus);
echo '</pre>';
echo '<h1>Data</h1><pre>';
print_r($recData);
echo '</pre>';