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Bug #23395 for loop = infinite loop in RC2
Submitted: 2003-04-28 22:33 UTC Modified: 2003-04-29 10:16 UTC
From: sprice at wisc dot edu Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.3.2RC2 OS: Mac OS X.2.5
Private report: No CVE-ID: None
View Developer Edit
 [2003-04-28 22:33 UTC] sprice at wisc dot edu 
With this loop:
<?php
for( $i = 1; $i <= 10000; $i *= 10 ){
	echo 'foo ';
}
?>

PHP drops into an infinite loop (lots of 'foo' gets 
printed). This problem didn't exist in PHP 4.3.2-RC1.

When changed to "; $i += 10 ){" it works as expected.

When changed to "; $i *= 9 ){" only one 'foo' is 
printed.

When changed to "; $i *= 11 ){" it is infinite.

When changed to "; $i *= 100 ){" only one 'foo' is 
printed.

Weird.

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 [2003-04-28 22:35 UTC] sprice at wisc dot edu 
I forgot to mention, configure:
./configure --with-apxs
 [2003-04-29 00:30 UTC] sprice at wisc dot edu 
BTW:
<?php
$i = 1;
$i *= 10;
echo $i;
?>

yields:
-2123890688
 [2003-04-29 01:23 UTC] derick@php.net 
I can not reproduce this at all.
 [2003-04-29 08:48 UTC] sprice at wisc dot edu 
I tried this on another OS X.2.5 Server machine that I 
administer with the same result. Both installations 
were compiled, etc. independently. The first was 10.2.5 
client tho.
 [2003-04-29 09:16 UTC] sprice at wisc dot edu 
$i = $i * 10; works just fine. Then when I go back to 
$i *= 10; it breaks again.
 [2003-04-29 09:33 UTC] edink@php.net 
I can confirm that:

sapi/cli/php -r '$i=1; $i *= 10; print $i;'

prints

-2123890688

on Mac OS X 10.2.5.

GNU Bison version 1.28
flex version 2.5.4
GCC 3.1 (Apple)
 [2003-04-29 09:49 UTC] edink@php.net 
*= operator seems to be broken on windows as well where the example prints 0.

The following commit seems to be the cause.

http://cvs.php.net/diff.php/Zend/zend_operators.c?r1=1.129.2.1&r2=1.129.2.2&ty=u
 [2003-04-29 10:16 UTC] wez@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
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