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Bug #53454 Memory leak when using non-static class member as static one or inversely
Submitted: 2010-12-02 19:36 UTC Modified: 2010-12-03 22:35 UTC
From: hritter at e-onsoftware dot com Assigned:
Status: Not a bug Package: Performance problem
PHP Version: 5.2.14 OS: Linux gentoo
Private report: No CVE-ID: None
 [2010-12-02 19:36 UTC] hritter at e-onsoftware dot com
I had some memory overflow errors. I logged the memory usage step by step and then I see a difference of 50Mo between two logs.

In the method called between this two logs, I used a static class attribute as a non-static one (with $this). The modification on the attribute took effect but triggered an "Interoperability or Compatibility Notice".
I fixed this error and I had a gain of 50 Mo!!

I have the same bug with a non-static method used as a static method (with self::). I had a gain of 90Mo because this method was really far away in the code.

It is a pretty harsh punishment for a compatibility error ;-)

Test script:
class LeakTester
	private static $nTest = 0;

	public function Test()
		echo $this->nTest."<br/>\n";

// ---> Test
$oTest = new LeakTester();
echo memory_get_usage()."<br/>\n"; // (1)
echo memory_get_usage()."<br/>\n"; // (2) > (1)

Expected result:
(2) should be equal to (1)

Actual result:
(2) is really greater than (1)


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 [2010-12-02 19:55 UTC] hritter at e-onsoftware dot com
-Status: Open +Status: Closed
 [2010-12-02 19:55 UTC] hritter at e-onsoftware dot com
I am really confused, the leak was due to the PHP debugger I implemented. (No leak when test the bug without this debugger)
 [2010-12-03 22:35 UTC]
-Status: Closed +Status: Bogus
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