Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc15.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
$modbus = new ModbusMasterUdp($ip);
// Data to be written - supports both 0/1 and booleans (true, false)
$data = array(
1, 0, 1, 1, 0, 1, 1, 1,
1, 1, 1, 1, 0, 0, 0, 0,
0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
);
try {
// FC15
$recData = $modbus->writeMultipleCoils($unitId, $reference, $data);
} 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>';