ID:               32833
 User updated by:  jason at amp-design dot net
 Reported By:      jason at amp-design dot net
 Status:           Verified
 Bug Type:         Zend Engine 2 problem
 Operating System: CentOS 4 / RHEL 3
 PHP Version:      5CVS-2005-04-26 (dev)
 New Comment:

I don't know what is defined by 'HEAD', but I have I have tested this
bug on older versions of of the PHP 5.1 branch admittedly they are only
a week or so old, as well as the latest snapshot and I get the same
problem. 

It doesn't happen on 5.0.4 or older. HOWEVER... older versions of PHP
also have inconsistent behavior, as the test code surely should display
a notice / warning... much like 

<?php
$f .= 'foo bar';
?>

produces a notice on version 5.0.4 and probably other older versions.


Previous Comments:
------------------------------------------------------------------------

[2005-04-26 13:28:34] [EMAIL PROTECTED]

Confirmed with HEAD only.

------------------------------------------------------------------------

[2005-04-26 12:11:57] jason at amp-design dot net

Description:
------------
Trying to concatenate on to a new/empty array element with the array
push assignment operator, [] =, causes PHP to create a fatal error.

This is tested with the CVS snapshot
http://snaps.php.net/php5-200504260830.tar.gz

Although the code I have given below is technically not correct because
you can not concatenate a string on to an empty/new array element, it
should be seen as an warning and not a fatal error (See notes on
expected result). Also, the error is not very descriptive from a end
user's point of view. I assume the invalid opcode error is obviously a
generic error message that is used by you guys at Zend for debugging.

Previous versions of PHP seem to inconsistent. The reproducable code
doesn't even give me a warning message when tested under PHP5.0.4.
Surely it would be right to make this consistent with concatenating an
undefined variable, by making a "Notice: Undefined variable: test[]"
error.

Reproduce code:
---------------
<?php 
$test = array();
$test[] .= 'blah';
?>

Expected result:
----------------
Some form of warning stating that you can not concatenate to an
empty/undefined array element. This should be consistent with the fact
that if you did...

<?php
$f .= 'foo bar';
?>

that you would get a warning message because $f has not been defined
before. (i.e. Notice: Undefined variable: f)

Actual result:
--------------
Fatal error: Invalid opcode 30/16/8


------------------------------------------------------------------------


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