ID: 37590
Comment by: judas dot iscariote at gmail dot com
Reported By: jesse at eonstreet dot com
Status: Open
Bug Type: *Math Functions
Operating System: Windows Xp / FC 3
PHP Version: 5.1.4
New Comment:
your first test returns "-4738672007" on Linux 64 bit. PHP_5_2 CVS.
Previous Comments:
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[2006-05-25 16:31:32] jesse at eonstreet dot com
Here is the code that had worked under 5.0.4 Windows / linux:
<?php
define('GOOGLE_MAGIC', 0xE6359A60);
class googleTools{
public static $url;
public function __construct($url = false){
}
public function GoogleCH($url, $length=null, $init=GOOGLE_MAGIC) {
if(is_null($length)) {
$length = sizeof($url);
}
$a = $b = 0x9E3779B9;
$c = $init;
$k = 0;
$len = $length;
while($len >= 12) {
$a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16)
+($url[$k+3]<<24));
$b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16)
+($url[$k+7]<<24));
$c += ($url[$k+8] +($url[$k+9]<<8)
+($url[$k+10]<<16)+($url[$k+11]<<24));
$mix = googleTools::mix($a,$b,$c);
$a = $mix[0]; $b = $mix[1]; $c = $mix[2];
$k += 12;
$len -= 12;
}
$c += $length;
switch($len) /* all the case statements fall through
*/
{
case 11: $c+=($url[$k+10]<<24);
case 10: $c+=($url[$k+9]<<16);
case 9 : $c+=($url[$k+8]<<8);
/* the first byte of c is reserved for the length */
case 8 : $b+=($url[$k+7]<<24);
case 7 : $b+=($url[$k+6]<<16);
case 6 : $b+=($url[$k+5]<<8);
case 5 : $b+=($url[$k+4]);
case 4 : $a+=($url[$k+3]<<24);
case 3 : $a+=($url[$k+2]<<16);
case 2 : $a+=($url[$k+1]<<8);
case 1 : $a+=($url[$k+0]);
/* case 0: nothing left to add */
}
$mix = googleTools::mix($a,$b,$c);
/*-------------------------------------------- report the result
*/
return $mix[2];
}
public function doGetRank($url) {
$url = 'info:'.$url;
$GoogleCH = googleTools::GoogleCH(googleTools::strord($url));
$url = urlencode($url);
$file =
"http://www.google.com/search?client=navclient-auto&ch=6$GoogleCH&features=Rank&q=$url";
//$data = file($file);
$ch = curl_init(); // initialize curl handle
curl_setopt($ch, CURLOPT_URL,$file); // set url to post to
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);// allow redirects
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); // return into a
variable
curl_setopt($ch, CURLOPT_TIMEOUT, 25); // times out after 4s
$data = curl_exec($ch); // run the whole process
curl_close($ch);
$rankarray = explode (':', $data);
$rank = $rankarray[2];
return $rank;
}
//converts a string into an array of integers containing the numeric
value of the char
private function strord($string) {
for($i=0;$i<strlen($string);$i++) {
$result[$i] = ord($string{$i});
$strResult .= $i ."-".$result[$i];
}
// echo "<br>".$strResult."<br>";
return $result;
}
//unsigned shift right
private function zeroFill($a, $b)
{
$aTemp =$a;
$z = hexdec(80000000);
if ($z & $a)
{
$a = ($a>>1);
$a &= (~$z);
$a |= 0x40000000;
$a = ($a>>($b-1));
}
else
{
$a = ($a>>$b);
}
return $a;
}
private function mix($a,$b,$c) {
$a -= $b; $a -= $c; $aTemp = $a; $a ^=
(googleTools::zeroFill($c,13));
$b -= $c; $b -= $a; $b ^= ($a<<8);
$c -= $a; $c -= $b; $c ^= (googleTools::zeroFill($b,13));
$a -= $b; $a -= $c; $a ^= (googleTools::zeroFill($c,12));
$b -= $c; $b -= $a; $b ^= ($a<<16);
$c -= $a; $c -= $b; $c ^= (googleTools::zeroFill($b,5));
$a -= $b; $a -= $c; $a ^= (googleTools::zeroFill($c,3));
$b -= $c; $b -= $a; $b ^= ($a<<10);
$c -= $a; $c -= $b; $c ^= (googleTools::zeroFill($b,15));
$arr = array($a,$b,$c);
print_a($arr);
return $arr;
}
}
?>
------------------------------------------------------------------------
[2006-05-25 13:28:30] jesse at eonstreet dot com
Yes, they are dependent to a point. But in 5.0.4 they returned the
same end value.
Something has changed in 5.1.x that no longer produces the correct
value.
------------------------------------------------------------------------
[2006-05-25 13:17:54] tony2001@php.net
Bitwise operators are architecture dependent.
And -4738698913 is actually not an integer, but a float on 32bit
platform.
------------------------------------------------------------------------
[2006-05-25 13:08:07] jesse at eonstreet dot com
Description:
------------
** Sorry if I havfe put this in hte wrong category.
I have encountered a difference in the output of a bit operator
combination between windows and FC3.
The example below is part of the code that produces the Google Checksum
when submitting to get a page rank.
In Mozilla Javascript and windows Javascript and well as PHP 5.1.4 on
whindows XP the bit operation returns correclty but under linux there
is a difference
I don't no why.
Reproduce code:
---------------
<?
$a = -4738698913;
echo $a ^= 43814;
?>
Expected result:
----------------
In Windows the result is -443704711
In Linux FC3 the result is -2147439834
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=37590&edit=1