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Bug #10924 long2ip gives wrong result/binary arithmatic does not work
Submitted: 2001-05-17 09:24 UTC Modified: 2001-12-07 08:33 UTC
From: richarde at eskom dot co dot za Assigned:
Status: Closed Package: Network related
PHP Version: 4.0.4pl1 OS: Linux Redhat 6.2
Private report: No CVE-ID:
 [2001-05-17 09:24 UTC] richarde at eskom dot co dot za
$x = 2473473034;         // 147.110.52.10 in int form
settype($x, "integer");  // this line has no effect on final result of long2ip

echo "long ".is_long($x);
echo "<P>";

$y = ip2long("147.110.52.10");
echo "long ".is_long($y);
echo "<P>";

echo ip2long("147.110.52.10");  // should be 2473473034
echo "<P>";

echo long2ip($y);               // correct result here
echo "<P>";

echo long2ip($x);               // wrong result
echo "<P>";

echo $y & 127;               // correct result
echo "<P>";

echo $x & 127;               // incorrect result - should be 10
echo "<P>";

**** cut ****

basically there is no way to do ip arithmatic using php - I cannot get large numbers like ip addresses from a database stored as integers and minipulate them - AND, OR and XOR do not work on large number as in example.

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 [2001-05-19 20:43 UTC] derick@php.net
There is no solution for this, because PHP only deals with signed longs.
However, you can now use the %u modifier in printf and sprintf to show a long unsigned number like this:

<?php
    printf ("%u\n", ip2long ("147.110.52.10"));
?>

2473473034

I suspended this bug, until unsigned longs are really working (there are some feature request for this already).

Derick
 [2001-12-07 08:33 UTC] sterling@php.net
long2ip is now fixed as well, as it accepts a string value, which is then properly converted to a unsigned long...
 
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