ID: 31635
User updated by: ivar at stvk dot no
Reported By: ivar at stvk dot no
-Status: Feedback
+Status: Open
Bug Type: Zend Engine 2 problem
Operating System: Irrelevant (WinXP)
PHP Version: 5.0.3
New Comment:
The only way I am able to reproduce this behavior is using COM, but the
nature of the bug is not directly linked to the COM libraries itself.
Because of this, I am unable to make a test case that is platform
independent and that does not require external resources.
I will try just once more:
Create a Visual Basic ActiveX DLL project. Name the project
'NullClass', and name the class 'Null'. Add this single function to the
class code:
Public Property Get Value()
Value = Null
End Property
Place the cursor inside the function, Click the menu "Tools",
"Procedure Properties", "Advanced", and select "User Interface
Default". Click "File", "Make NullClass.dll".
Then run this PHP script:
<?php
$Obj = new COM('NullClass.Null');
echo $Obj;
?>
EXPECTED: The script does not output anything, because the object
contains a NULL value.
ACTUAL: The script either outputs garbage or causes an Access Violation
message.
Previous Comments:
------------------------------------------------------------------------
[2005-01-29 20:41:32] [EMAIL PROTECTED]
Could you please provide an example that doesn't require any external
resources (especially those that exist only under a particular OS) ?
Also please post what you expect and what you got when you execute the
reproduce code.
------------------------------------------------------------------------
[2005-01-25 08:53:51] ivar at stvk dot no
To reproduce the bug, use this script. Let 'TestDatabase' be any kind
of database, and let the table field 'Table'.'NullField' be any
database field that contains a NULL value.
<?php
try {
$DB = new COM("ADODB.Connection") or die("Cannot start ADO");
$DB->Open("DRIVER={SQL
Server};SERVER=SERVER\WEB;DATABASE=TestDatabase");
$RS = new COM("ADODB.Recordset");
$RS->Open("SELECT TEXT FROM Table", $DB);
echo $RS["NullField"];
} catch (Exception $e) {
echo $e->getTraceAsString() . "<br>";
echo $e->getMessage();
}
?>
------------------------------------------------------------------------
[2005-01-25 01:01:58] [EMAIL PROTECTED]
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves.
A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external
resources such as databases, etc.
If possible, make the script source available online and provide
an URL to it here. Try to avoid embedding huge scripts into the report.
------------------------------------------------------------------------
[2005-01-21 15:15:04] ivar at stvk dot no
Description:
------------
zend_make_printable_zval:
Before returning with *use_copy=1, this function assumes that the
preceding code has successfully converted the value to a sting, and
therefore sets expr_copy->type = IS_STRING.
If the original value IS_OBJECT, this function relies on any 3rd party
cast handler to successfully return a string.
Some libraries have been observed to break this rule, and return a
value only initialized by ZVAL_NULL. This makes the system try to print
a string from a garbage pointer.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=31635&edit=1
