Posted by Richard Lynch on 03/30/05 00:42

On Tue, March 29, 2005 1:27 pm, René Fournier said:
> I need to output a Hex value, e.g.:
>
> 686E8AF8
>
> In the following format:
>
> 68 6E 8A F8
>
> In other words, separated by spaces. Now I realize there are a million
> ways to do this, but I would like a suggestion on which you think is
> the most efficient? Incidentally, I'm starting with a decimal value
> (23602210718), so maybe sprintf would be a direct way?

sprintf and "most efficient" rarely belong in the same sentence. :-)

I believe this is going to "win" almost any efficiency test, and is
reasonably self-documenting/clear:

$dec = 23602210718;
$hex = dechex($dec);
echo implode(' ', chunk_split($hex, 2));

Note that dechex only supports numbers up to 0xFFFFFFFF

In older PHP versions, I believe the limit was lower than that. 0x7FFFFFFF
perhaps, based on the user notes.

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