From: raulsanchezt at gmail dot com
Operating system: Fedora 6
PHP version: 5.2.10
PHP Bug Type: *Programming Data Structures
Bug description: while() is not working on PHP5 as it always did
Description:
------------
What you'll see below are three versions of the same code. Version a)
worked for me all along PHP4 (for years and years). After upgrading to PHP5
it's not working anymore. Version b) does not work either. Version c) does
work.
Version a) runs indefinitely until I Ctrl-C it.
Version b) runs indefinitely until I Ctrl-C it.
Version c) runs for a millionth of a second and shows the expected result
This code is a great simplification of what I actually coded (a MySQL
wrapper). I spent two full weeks trying to find out what was wrong with my
new PHP5/MySQL/Zend Debugger/Eclipse implementation until I bumped into
this little, unbelievable, never-to-be-expected bug.
Reproduce code:
---------------
// version a) while() does not work anymore
$v_x = 0;
$v_success = false;
$_SESSION["v_attempts"] = 20;
while(!$v_success or ($v_x < $_SESSION["v_attempts"]))
{
// irrelevant code that may change the value of $v_success
$v_x++;
}
// version b) while() does not work either
$v_x = 0;
$v_success = false;
$_SESSION["v_attempts"] = 20;
while((!$v_success) or ($v_x < $_SESSION["v_attempts"]))
{
// irrelevant code that may change the value of $v_success
$v_x++;
}
// version c) this one works
$v_x = 0;
$v_success = false;
$_SESSION["v_attempts"] = 20;
while(($v_success = false) or ($v_x < $_SESSION["v_attempts"]))
{
// irrelevant code that may change the value of $v_success
$v_x++;
}
Expected result:
----------------
I expect to see the actual value of $v_x, which should be 20.
Actual result:
--------------
(gdb) run testfile.php
Starting program: /usr/local/zend/bin/php testfile.php
warning: Lowest section in system-supplied DSO at 0xffffe000 is .hash at
ffffe0b4
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 4160407232 (LWP 24052)]
Error while reading shared library symbols:
Cannot find new threads: generic error
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
Segmentation fault
NOTE: all three versions produce this output. The three versions run the
same as CGIs and as Firefox scripts.
--
Edit bug report at http://bugs.php.net/?id=48923&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=48923&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=48923&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=48923&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=48923&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=48923&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=48923&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=48923&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=48923&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=48923&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=48923&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=48923&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=48923&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=48923&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=48923&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48923&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=48923&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=48923&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=48923&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=48923&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=48923&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=48923&r=mysqlcfg
