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Bug #6678 Different behaviour of arithmetic operations on Linux PHP and Windows PHP
Submitted: 2000-09-12 05:41 UTC Modified: 2004-10-19 18:29 UTC
From: info at emre dot de Assigned:
Status: Closed Package: Unknown/Other Function
PHP Version: 4.0.2 OS: Windows 2000 & SuSE Linux
Private report: No CVE-ID: None
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 [2000-09-12 05:41 UTC] info at emre dot de 
<html> 
<body> 
<? 

/* Fuction to turn an integer into an ip address */

function int2ip($int) 
  { 
    // There are 4 bytes to handle, so let?s go for it ....
    for ($i=0 ; $i < 4 ; $i++) {
 
     // Let?s leave only the first 8 bits, kill the rest and assign the value to an array element
      $bytes[$i] = $int & 0xFF; 
   
     // Now move the remaining bits to the right and go on with the next byte ... 
      $int = $int >> 8;
   
    } 

    // The array containing the bits is joined to a string, the bytes separated by a dot 
    $ip = "$bytes[3].$bytes[2].$bytes[1].$bytes[0]"; 
 
   return ($ip); 
  } 

print int2ip(3232235648); 

/* 
  Result should be 192.168.0.128. On WAMP it works fine,
  on LAMP it doesn?t.
  Maybe this one?s not bug but I?m too dump - still this "wrong" behaviour
  has been verfied on several Linux systems running Apache and PHP.
  The correct one has been verified on three Windows systems running
  Apache and PHP (latest)
*/

?> 
</body> 
</html>

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 [2000-10-15 11:25 UTC] lyric@php.net 
Your problem is probably due to the size of the numeric datatype (which is system dependant). The number that you're passing is actually too big (ie: over 2 billion).

See http://www.php.net/manual/language.types.php
 
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