php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #9718 Memory leak when passing String values into methods through COM
Submitted: 2001-03-12 21:48 UTC Modified: 2001-03-21 13:24 UTC
From: Jason at hspace dot net Assigned:
Status: Closed Package: COM related
PHP Version: 4.0 Latest CVS (12/03/2001) OS: Windows 2000
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
(description)
Block user comment
Status: Assign to:
Package:
Bug Type:
Summary:
From: Jason at hspace dot net
New email:
PHP Version: OS:

 

 [2001-03-12 21:48 UTC] Jason at hspace dot net
I added methods to pass String values into the static variables.
Passing String values into method in COM object also leaks memory.

Example:

COM object has method test(String a) and a static variable b
The method sets the variable b to a.

In PHP, I execute the COM object's method:

$t_obj->test("This is a test string.");

Memory leak when passing String into COM object.

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2001-03-12 21:57 UTC] Jason at hspace dot net
Found the problem.
It only leaks memory, if I pass a CONSTANT from PHP to the COM object.
All I have to do now is rewrite the php so that I'm passing a variable, not a constant.

Probably this issue can be closed after someone has a look into it.
 [2001-03-12 22:18 UTC] Jason at hspace dot net
That wasn't it... I tried it without passing a constant, and it's still leaking memory! So this is an outstanding serious bug with no workaround.
 [2001-03-13 23:22 UTC] Jason at hspace dot net
Bug #9715 is reclassified under this bug.

> Memory leak when passing String value to a static variable in the COM object.
> Memory leak when passing String value as an argument in a method exposed by the COM object.


> I use VJ++ to write COM objects, as Java handles its own garbage collection.

Running php 4.0.5-dev ISAPI in IIS 5.0
 [2001-03-14 09:06 UTC] Jason at hspace dot net
Corrections to bug report. Ignore previous example, check with the below example instead.

I'm actually assigning values from inside a child class in PHP and accessing the COM object in the base class.

eg:

<?php

class Child {
  function Child () {
    Base::instance();
    $this->obj->testvar = "This is a test string.";
  }
}

class Base {
  function instance() {
    $this->obj = new COM("MyObject.MyObject");
  }

}

?>

/ Leaks memory when I assign a string to a public variable (testvar) of COM object (obj) from an instance of Child.

Disregard my previous examples as I've tested my COM object with a simple string passed as argument to method and it did not leak memory.

I think the above memory leak has something to do with PHP's handling of Object Oriented Programming...

 [2001-03-14 16:46 UTC] Jason at hspace dot net
Disregard my previous example with the classes. I've just tried a test without using classes and it still leaks memory. Consider example below instead, thanks:

Code block sets multiple public variables in COM object.
In below example, $gbl_obj is an instance of the COM object in the global scope of the PHP page. The public variables are defined as html_example_test01, html_example_test02, html_example_test03, etc. etc. My code block sets over twenty public variables in the COM object.

<? Code block sets all public variables in COM object

$gbl_obj->html_example_test01 = "Test string #01.";
$gbl_obj->html_example_test02 = "Test string #02.";
$gbl_obj->html_example_test03 = "Test string #03.";
$gbl_obj->html_example_test04 = "Test string #04.";
$gbl_obj->html_example_test05 = "Test string #05.";
$gbl_obj->html_example_test06 = "Test string #06.";
$gbl_obj->html_example_test07 = "Test string #07.";
$gbl_obj->html_example_test08 = "Test string #08.";
$gbl_obj->html_example_test09 = "Test string #09.";
$gbl_obj->html_example_test10 = "Test string #10.";
$gbl_obj->html_example_test11 = "Test string #11.";
$gbl_obj->html_example_test12 = "Test string #12.";
$gbl_obj->html_example_test13 = "Test string #13.";
$gbl_obj->html_example_test14 = "Test string #14.";
$gbl_obj->html_example_test15 = "Test string #15.";
$gbl_obj->html_example_test16 = "Test string #16.";
$gbl_obj->html_example_test17 = "Test string #17.";
$gbl_obj->html_example_test18 = "Test string #18.";
$gbl_obj->html_example_test19 = "Test string #19.";
$gbl_obj->html_example_test20 = "Test string #20.";

// script does not leak memory when I remove this code block
?>

I am using long variable names like html_example_test01





 [2001-03-14 16:58 UTC] Jason at hspace dot net
On that note, changing code to below also leaks memory.
Variables html_example_test01, etc are declared as public static variables in the COM component.
Methods set_html_example_test01() etc set the static variables to the string values passed through the argument.

<? Code block sets all public static variables

$gbl_obj->set_html_example_test01("Test string #01.");
$gbl_obj->set_html_example_test02("Test string #02.");
$gbl_obj->set_html_example_test03("Test string #03.");
$gbl_obj->set_html_example_test04("Test string #04.");
$gbl_obj->set_html_example_test05("Test string #05.");
$gbl_obj->set_html_example_test06("Test string #06.");
$gbl_obj->set_html_example_test07("Test string #07.");
$gbl_obj->set_html_example_test08("Test string #08.");
$gbl_obj->set_html_example_test09("Test string #09.");
$gbl_obj->set_html_example_test10("Test string #10.");
$gbl_obj->set_html_example_test11("Test string #11.");
$gbl_obj->set_html_example_test12("Test string #12.");
$gbl_obj->set_html_example_test13("Test string #13.");
$gbl_obj->set_html_example_test14("Test string #14.");
$gbl_obj->set_html_example_test15("Test string #15.");
$gbl_obj->set_html_example_test16("Test string #16.");
$gbl_obj->set_html_example_test17("Test string #17.");
$gbl_obj->set_html_example_test18("Test string #18.");
$gbl_obj->set_html_example_test19("Test string #19.");
$gbl_obj->set_html_example_test20("Test string #20.");

// script does not leak memory when I remove this code block
?>


I hope this clarifies the problem. Earlier examples weren't right as I have done lots of code with COM which work without leaking memory.
 [2001-03-20 17:44 UTC] phanto@php.net
could you try again with the latest cvs version. i've rewritten a lot.

harald
 [2001-03-20 17:59 UTC] Jason at hspace dot net
I think that you've fixed the problem. Thanks.
 [2001-03-21 13:24 UTC] phanto@php.net
fixed.
 
PHP Copyright © 2001-2019 The PHP Group
All rights reserved.
Last updated: Tue Mar 19 15:01:27 2019 UTC