#40608 [NEW]: break within foreach causes strange behaviour

[eric dot broersma at phil dot uu dot nl]

From: eric dot broersma at phil dot uu dot nl
Operating system: Sun Solaris
PHP version: 5.2.1
PHP Bug Type: Arrays related
Bug description: break within foreach causes strange behaviour

Description:
------------
A break within a foreach construct may cause an infinite loop when the
foreach construct is nested within another foreach construct, possibly as
a result of the internal array pointer of the array being foreach'ed not
being reset.

This problem did not occur in PHP 5.0.5, but did occur in PHP 5.2.1.

Reproduce code:
---------------
$w = array ( 0, 1 );

echo 'a';
foreach ( $w as $x ) {
echo 'b' . $x;
foreach ( $w as $z ) {
echo 'c' . $z;
break 1;
}
echo 'e' . $x;
}
echo 'f';

Expected result:
----------------
ab0c0e0b1c0e1f


(Behaviour in PHP 5.0.5)

Actual result:
--------------
ab0c0e0b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c 0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e 2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b 1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c 0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e 1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c 0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e 2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b 1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c 0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e 1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c 0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e 2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b 1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c 0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e 1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0!
e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2 b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1 c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0 e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1 b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2 c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0 e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2 b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1 c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0 e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1 b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2 c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0 e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b...
(infinite loop)

(Behaviour in PHP 5.2.1)

--
Edit bug report at [url]http://bugs.php.net/?id=40608&edit=1[/url]
--
Try a CVS snapshot (PHP 4.4): [url]http://bugs.php.net/fix.php?id=40608&r=trysnapshot44[/url]
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Try a CVS snapshot (PHP 6.0): [url]http://bugs.php.net/fix.php?id=40608&r=trysnapshot60[/url]
Fixed in CVS: [url]http://bugs.php.net/fix.php?id=40608&r=fixedcvs[/url]
Fixed in release: [url]http://bugs.php.net/fix.php?id=40608&r=alreadyfixed[/url]
Need backtrace: [url]http://bugs.php.net/fix.php?id=40608&r=needtrace[/url]
Need Reproduce Script: [url]http://bugs.php.net/fix.php?id=40608&r=needscript[/url]
Try newer version: [url]http://bugs.php.net/fix.php?id=40608&r=oldversion[/url]
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Expected behavior: [url]http://bugs.php.net/fix.php?id=40608&r=notwrong[/url]
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Submitted twice: [url]http://bugs.php.net/fix.php?id=40608&r=submittedtwice[/url]
register_globals: [url]http://bugs.php.net/fix.php?id=40608&r=globals[/url]
PHP 3 support discontinued: [url]http://bugs.php.net/fix.php?id=40608&r=php3[/url]
Daylight Savings: [url]http://bugs.php.net/fix.php?id=40608&r=dst[/url]
IIS Stability: [url]http://bugs.php.net/fix.php?id=40608&r=isapi[/url]
Install GNU Sed: [url]http://bugs.php.net/fix.php?id=40608&r=gnused[/url]
Floating point limitations: [url]http://bugs.php.net/fix.php?id=40608&r=float[/url]
No Zend Extensions: [url]http://bugs.php.net/fix.php?id=40608&r=nozend[/url]
MySQL Configuration Error: [url]http://bugs.php.net/fix.php?id=40608&r=mysqlcfg[/url]

[tony2001@php.net]

ID: 40608
Updated by: [email]tony2001@php.net[/email]
Reported By: eric dot broersma at phil dot uu dot nl
-Status: Open
+Status: Feedback
Bug Type: Arrays related
Operating System: Sun Solaris
PHP Version: 5.2.1
New Comment:

Cannot reproduce.
Make sure you don't have any zend_extension's like ionCube, Zend
Optimizer, APC, eAccelerator etc.


Previous Comments:
------------------------------------------------------------------------

[2007-02-23 16:49:12] eric dot broersma at phil dot uu dot nl

Description:
------------
A break within a foreach construct may cause an infinite loop when the
foreach construct is nested within another foreach construct, possibly
as a result of the internal array pointer of the array being foreach'ed
not being reset.

This problem did not occur in PHP 5.0.5, but did occur in PHP 5.2.1.

Reproduce code:
---------------
$w = array ( 0, 1 );

echo 'a';
foreach ( $w as $x ) {
echo 'b' . $x;
foreach ( $w as $z ) {
echo 'c' . $z;
break 1;
}
echo 'e' . $x;
}
echo 'f';

Expected result:
----------------
ab0c0e0b1c0e1f


(Behaviour in PHP 5.0.5)

Actual result:
--------------
ab0c0e0b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c 0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e 2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b 1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c 0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e 1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c 0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e 2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b 1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c 0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e 1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c 0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e 2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b 1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c 0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e 1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b 2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0!
e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2 b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1 c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0 e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1 b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2 c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0 e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2 b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1 c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0 e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1 b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2 c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b2c0 e2b1c0e1b2c0e2b1c0e1b2c0e2b1c0e1b...
(infinite loop)

(Behaviour in PHP 5.2.1)


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40608&edit=1[/url]