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Bug #68417 PDO extending objects loose their attributes
Submitted: 2014-11-14 08:07 UTC Modified: 2020-09-01 13:35 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: wuttke at hd-system dot de Assigned: cmb (profile)
Status: Feedback Package: PDO MySQL
PHP Version: Irrelevant OS: Ubuntu 14.0.4.1 LTS
Private report: No CVE-ID: None
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 [2014-11-14 08:07 UTC] wuttke at hd-system dot de
Description:
------------
A class that extends pdo uses a persistant mysql-connection.
Different objects of this class are constructed, but as soon as a reference on one of these objects is reused, all of the objects that exist at this moment loose their attributes.
Objects created after this procedure have their attributes.

Tested with php 5.9 and 5.18

Test script:
---------------
$o1 = new mysqlPDO('test_db', 'mydbserver.hds', 'root', '');
$o2 = new mysqlPDO('test_db', 'mydbserver.hds', 'root', '');
$o3 = new mysqlPDO('test_db', 'mydbserver.hds', 'root', '');
echo 'o1: '.$o1->attr.'<br>';
echo 'o2: '.$o2->attr.'<br>';
echo 'o3: '.$o3->attr.'<br>';
$o2 = new mysqlPDO('test_db', 'mydbserver.hds', 'root', '');//At this point, o1-o3 loose their attributes
echo 'o1: '.$o1->attr.'<br>';
echo 'o2: '.$o2->attr.'<br>';
echo 'o3: '.$o3->attr.'<br>';
$o4 = new mysqlPDO('test_db', 'mydbserver.hds', 'root', '');//This one has attributes again
echo 'o4: '.$o4->attr.'<br>';

Expected result:
----------------
o1: abc
o2: abc
o3: abc
o1: abc
o2: abc
o3: abc
o4: abc

Actual result:
--------------
o1: abc
o2: abc
o3: abc
o1:
o2:
o3:
o4: abc

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 [2014-11-14 08:16 UTC] wuttke at hd-system dot de
The class itsself got lost when I copied the code in the textarea:

class mysqlPDO extends pdo
{
	public function  __construct($db_name, $host, $username, $passwd)
	{
		$this->attr = 'abc';
		parent::__construct('mysql:dbname='.$db_name.';host='.$host, $username, $passwd, array(PDO::ATTR_PERSISTENT => true));
	}
}
 [2020-09-01 13:35 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2020-09-01 13:35 UTC] cmb@php.net
Can you still reproduce this with any of the actively supported
PHP versions[1]?

[1] <https://www.php.net/supported-versions.php>
 
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