Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc23.php

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<?php
require_once dirname(__FILE__) . './Phpmodbus/ModbusMasterUdp.php';
// Create Modbus object
$modbus = new ModbusMasterUdp("192.168.1.99");
// Data to be writen
$data = array(1000, 2000, 3.0);
$dataTypes = array("INT", "DINT", "REAL");
// FC23
$recData = $modbus->readWriteRegisters(0, 12288, 6, 12288, $data, $dataTypes);
if(!$recData) {
// Print error information if any
echo "</br>Error:</br>" . $modbus->errstr . "</br>";
}
// Print status information
echo "</br>Status:</br>" . $modbus->status . "</br>";
// Print read data
echo "</br>Data:</br>"; print_r($recData); echo "</br>";
?>