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;
// Create Modbus object
$modbus = new ModbusMasterUdp("192.192.15.51");
// Data to be writen - TRUE, FALSE
$data_true = array(true);
$data_false = array(false);
try {
// Write single coil - FC5
$modbus->writeSingleCoil(0, 12288, $data_true);
$modbus->writeSingleCoil(0, 12289, $data_false);
$modbus->writeSingleCoil(0, 12290, $data_true);
$modbus->writeSingleCoil(0, 12291, $data_false);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}