Posted by petersprc on 12/06/06 01:12

Try pack('n*', 0x1234, 0x5678, 0x9abc, 0xdef0)

CptDondo wrote:
> I am working with a communications protocol that requires me to pack an
> array of integers into a binary 'string'.
>
> Let's say I have this:
>
> int[0] = 0x1234
> int[2] = 0x5678
> int[3] = 0x9abc
> int[4] = 0xdef0
>
> I have to produce a string containing
>
> 0x 12 34 56 78 9a bc de f0
>
> and send it off. The string contains the ints packed together in
> big-endian order: HI LO HI LO HI LO.
>
> In C, I can do this pretty easily, but I am not familiar enough with
> PHP's data handling. I don't even know where to begin.
>
> I know PHP can do it, since it handles images but how do you build
> something like this from scratch? How can you build a string byte by byte?
>
> --Yan

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