note 59272 added to language.oop5.decon
| From: | aya at eh dot org | Date: | Thu, 01 Dec 2005 10:20:51 +0000 |
| Subject: | note 59272 added to language.oop5.decon | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-99410@lists.php.net to get a copy of this message | ||
For those who aren't already aware, PHP5 currently suffers from the classic reference counting
leak. See http://en.wikipedia.org/wiki/Reference_counting
for more info.
Example code:
<?php
class Noisy
{
private $name;
public function __construct($name)
{
$this->name = $name;
echo "Noisy::__construct($this->name)\n";
}
public function __destruct()
{
echo "Noisy::__destruct($this->name)\n";
}
}
function foo($num)
{
$noisy = new Noisy($num);
//$noisy->me = $noisy; // Uncomment this line to create a cyclic reference
}
for ($i = 0; $i < 10; ++$i)
foo($i);
?>
As it stands, the destructor of class 'Noisy' will be called on '$noisy' when it
goes out of scope in function 'foo', but uncommenting the second line in function
'foo' will prevent this, and cause a memory leak.
See http://bugs.php.net/bug.php?id=33595 for a
bug report, which reads as if this is not likely to get fixed in the near future, so watch out!
----
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