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Posted by Renι Fournier on 10/20/86 11:14
I've looked in the docs and don't see anything for this per se...
I need to convert a binary number of arbitrary length to a signed
integer.
This is how I'm doing it now:
CODE
--------
function bin2int ($bin) {
if (substr($bin,0,1) == 1) {
$val = 0 - bindec(substr($bin,1)); // NEGATIVE
} else {
$val = bindec(substr($bin,1)); // POSITIVE
}
}
echo bin2int("00001101").'<br />';
echo bin2int("10001101");
OUTPUT
--------
13
-13
As you can see, if the most-significant bit is 1, then the rest of the
value is negative. If the first bit is 0, then the rest is positive. Is
there a better, faster (execution-wise) way of doing this? Maybe a more
built-in function of PHP I missed? It's something that my script will
be doing thousands of times, so I am concerned about speed.
Thanks!
....Rene
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