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Old August 5th, 2002, 08:45 AM
mike_sp mike_sp is offline
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Question XOR Problem when converting from JavaScript to PHP

hi,


i want to convert a javascript programm to php an encountered the following problem:

there is a part in the javascript file, where an XOR operation is performed by:

[javascript:]
t2=959077477;
m=7127917138;
x1 = t2 ^ m;
alert(x1);
-> resulting in: -1846460873

(t2 and m are variables, i just used the values where the problem occures)

when i convert this to php:
[php:]
$t2=959077477;
$m=7127917138;
$x1 = $t2 ^ $m;
echo "<br>".$t2." XOR ".$m." = ".$x1;

the result is: -959077478

does anyone know why those 2 values are diffrent ?
is there a problem with the length of the numbers (if yes how can i solve it)

thanks,
mike

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Old August 12th, 2002, 12:58 PM
ryanh ryanh is offline
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I'm not a pro at this, but I'd say your problem is with the floating point precission of integers... those are large numbers you're throwing around, and when you raise one to the other, it's getting huge... Don't know how exactly to solve that...

Perhaps look up a better algorithm using google?

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Old August 12th, 2002, 01:17 PM
mike_sp mike_sp is offline
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thanks again on that one...

i thought so myself.
i used a different server an there it worked (it also did on my old test server back home).
so i kinda solved the problem by avoiding it *g*

mike

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