Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc4.php

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<?php
use PHPModbus\ModbusMasterUdp;
// Create Modbus object
$modbus = new ModbusMasterUdp("192.192.15.51");
try {
// Read input discretes - FC 4
$recData = $modbus->readMultipleInputRegisters(0, 0, 2);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
var_dump($recData);