Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/tests/PhpType/test.bytes2signedint.php

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12 years ago
<?php
require_once dirname(__FILE__) . '/../../Phpmodbus/ModbusMasterUdp.php';
// Received bytes interpreting DINT values
$data = array(
0xFF, // -1
0xFF,
0xFF,
0xFF,
0, // 0
0,
0,
0,
0, // 1
0x01,
0,
0,
0, // minus max
0,
0x80,
0x0,
0xFF, // plus max
0xFF,
0x7F,
0xFF,
);
$dword = array_chunk($data, 4);
// Print float interpretation of the real value
foreach($dword as $value) {
echo PhpType::bytes2signedInt($value) . "<br>";
}
?>