From: steemann at globalpark dot de
Operating system: Linux 2.6.12-10-686
PHP version: 5.2.0RC1
PHP Bug Type: Class/Object related
Bug description: static variables mess up global vars
Description:
------------
Variables in the global scope seem to keep corrupted when using static
properties/variables.
The script below has a global variable $not_there which is supposed to be
NULL
as it is not set. It is NULL when var_dumping it.
Although the variable is not set by the script, the variable value changes
during
execution so the script evaluates
if ($not_there["invalid_var"]))
to true obviously. When printing a hash of the variable ("use_authmodule"
which
does not exist), the variable seems to be an array but it should be NULL.
btw: magic_quotes_gpc is turned on.
Reproduce code:
---------------
something::do_something((int) $argv[1]);
// $not_there is really NULL
var_dump($not_there);
// error occurs here: execution should never get inside the if condition
because $not_there is NULL
if ($not_there["invalid_var"])
{
// will print NULL (which is ok, but execution should never get here if
the value is NULL)
var_dump($not_there["use_authmodule"]);
// will print "PATH:Array"
print "PATH:".$not_there["use_authmodule"];
}
class something
{
protected static $static_var=array();
public static function get_object()
{
static $object=NULL;
if ($object===NULL)
$object=new something;
return $object;
}
public static function do_something($version=0)
{
if ($version==0)
{
// $argv[1]==0: this will cause the error
foreach (array("g"=>&$_GET,"p"=>&$_POST,"r"=>&$_REQUEST) as
$var_name=>$super_global)
self::get_object()->static_var[]=$var_name;
} // end of version 0
if ($version==1)
{
// $argv[1]==1: this does the same but will not cause the error
$obj=self::get_object();
foreach (array("g"=>&$_GET,"p"=>&$_POST,"r"=>&$_REQUEST) as
$var_name=>$super_global)
$obj->static_var[]=$var_name;
} // end of version 1
} // end of do_something method
} // end of class something
Expected result:
----------------
expected result for $argv[1]==0:
NULL
result for $argv[1]==1:
NULL
Actual result:
--------------
Call the script above on the command line with $argv[1]=0.
Script execution gets into the "if ($not_there...)" part as the global
variable
$not_there gets corrupted.
result is:
NULL
NULL
PATH:Array
result for $argv[1]=1:
NULL
So the problem does not occur if the script is called with $argv[1] = 1.
The $argv interpretation and actual difference in the code is in method
do_something() of class "something".
I know the static property $static_var of class "something" should not be
accessed via -> because it is static, but the code worked fine in PHP 5.1
and also works fine when using version 1 ($argv[1]=1).
--
Edit bug report at http://bugs.php.net/?id=38287&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=38287&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=38287&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=38287&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=38287&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=38287&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=38287&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=38287&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=38287&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=38287&r=support
Expected behavior: http://bugs.php.net/fix.php?id=38287&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=38287&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=38287&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=38287&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=38287&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=38287&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=38287&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=38287&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=38287&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=38287&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=38287&r=mysqlcfg
