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

[download]

The closest pack equivalent to a (byte)val would be 

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

[download]

or 

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

[download]

depending on your machine. That could be made portable as 

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

[download]

which simplifies to 

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

[download]

But what a waste.

Update: Added the content underneath the bar.

In reply to Re: pack and unpack trouble by ikegami
in thread pack and unpack trouble by scoobyrico

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