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$mCrc = $mPolyTable[ ( $mCrc ^ $iByteArray[$x] ) & 0xFF ];

unpack('C', substr(pack('J', $val), 0, 1))

unpack('C', substr(pack('J', $val), -1, 1))

unpack('C', substr(pack('J<', $val), 0, 1))

unpack('C', pack('J<', $val))