用php计算CRC16 X25

我需要帮助计算CRC X25变量，我有一个Java工具，也有一个在线工具，可以提供正确的转换，但我自己还不能复制它

字符串：4040290003323334C323031373030313839336000000000009001FFFFFF0000D656B759 输入类型：十六进制->计算CRC16

Result: CRC-16/X-25 
0x6C49 <-- this is the value im trying to get in php from that string above.

这给了我如下的结果

ComputeCrc(str_split("40402900033231334C323031373030313839360000000000009001FFFFFFFF0000D656B759", 2));
Result = ec71 <-- decHex result

calculate("40402900033231334C323031373030313839360000000000009001FFFFFFFF0000D656B759");
Result = 48d7; <-- decHex result

ComputeCrc（str_split（“4040290003323334c23031373030313839336000000000009001ffffff0000d656b759”，2））；
结果=ec71在计算前应用hexdec解决了该问题，可能在将来有用

public static function ComputeCrc($data) {
    $crc = 0xFFFF;

    foreach ($data as $d) {
        $d = hexdec($d); <-- This did the trick
        $crc = self::$CRC16_Table[($d ^ $crc) & 0xFF] ^ ($crc >> 8 & 0xFF);
    }

    $crc = $crc ^ 0xFFFF;
    $crc = $crc & 0xFFFF;

    return $crc;
}

公共静态函数ComputeCrc（$data）{
$crc=0xFFFF；
foreach（$d数据）{
$d=hexdec（$d）；>8&0xFF）；
}
$crc=$crc^0xFFFF；
$crc=$crc&0xFFFF；
返回$crc；
}

public static function ComputeCrc($data) {
    $crc = 0xFFFF;

    foreach ($data as $d) {
        $d = hexdec($d); <-- This did the trick
        $crc = self::$CRC16_Table[($d ^ $crc) & 0xFF] ^ ($crc >> 8 & 0xFF);
    }

    $crc = $crc ^ 0xFFFF;
    $crc = $crc & 0xFFFF;

    return $crc;
}