ID: 16245
Updated by: [EMAIL PROTECTED]
-Summary: Static variables into class member funtions have wrong
scope
Reported By: [EMAIL PROTECTED]
Status: Open
Bug Type: Documentation problem
-Operating System: Windows 2000
+Operating System: Windows 2000 Server
-PHP Version: 4.1.1
+PHP Version: 4.0.6
New Comment:
> I guess this is expected behaviour.
I can't agree with it. If there is two separate instances of a class -
they must have no common variables, but they have.
> Reclassified as a documentation problem.
> (BTW you can use global $cnt to overcome this problem)
No, problem can be solved by having member variable instead of static.
Previous Comments:
------------------------------------------------------------------------
[2002-03-24 14:22:08] [EMAIL PROTECTED]
I guess this is expected behaviour.
Reclassified as a documentation problem.
(BTW you can use global $cnt to overcome this problem)
------------------------------------------------------------------------
[2002-03-24 11:28:51] [EMAIL PROTECTED]
Static variables inside member functions of a classes have wrong
scope. They should belong to each instance of a class, like normal
class properties, but they're belong to class definition instead and,
therefore, shared between every instance of this class. It makes static
variables unusable into class member variables.
Here is an example:
// Define class
class A
{
var $id = null;
function A($id)
{
$this->id = $id;
}
function func()
{
// Here we have counter into static variable
static $cnt;
if (!$cnt)
$cnt = 0;
// Show counter value and ID of a class instance
echo $this->id.": ".($cnt++)."\n";
}
};
// Create 2 instances of our class with different IDs
$a = new A('A');
$b = new A('B');
// Call method of each class instance twice and see,
// what will happen
$a->func();
$b->func();
$a->func();
$b->func();
Expected results:
-----------------
A: 0
B: 0
A: 1
B: 1
Actual results:
---------------
A: 0
B: 1
A: 2
B: 3
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=16245&edit=1
