ID: 16227
Comment by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
Status: Open
Bug Type: Documentation problem
Operating System: ANY
PHP Version: PHP4 only
New Comment:
Well, so is it fixed or is it not? This bug's status is still Open.
Previous Comments:
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[2002-10-01 06:28:18] [EMAIL PROTECTED]
FYI. The bug is fixed. Current CVS version does not swap internal hash
position on assinment.
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[2002-10-01 06:13:17] [EMAIL PROTECTED]
The issue is ZendEngine mess up hash position by assignment.
I'll open new one for this.
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[2002-07-16 11:22:34] [EMAIL PROTECTED]
each() as a function does not know in which context it was called so it
just returns the 'current' element and advances the internal position
pointer, very similar to the java next_element() iterator (hope i got
the name right). when no more elements are left it returns false until
being reset
each() can not know that it was called from different loop runs so it
will return false forever until reset. one might
think about auto-reseting it after returning false once, but backwards
compatibility will be in our way once again here
the problem does not happen this way in java because there
next_element() advances the internal pointer before returning values
and you have to use first_element() to get
the first one (which implies a reset)
foreach uses a private copy of the array structure so it has its own
internal pointer which is recreated for every foreach instance so the
problem does occure here
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[2002-03-23 20:44:45] [EMAIL PROTECTED]
Oops,
$arr = array('a', 'b', 'c');
does reset position :)
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[2002-03-23 20:39:56] [EMAIL PROTECTED]
Both each() and foreach() uses internal hash position variable.
Difference is foreach() reset internal hash position to the first
element while each() does not.
A problematic behavior is an assignment resets internal hash
position. There are other cases programmer has to be careful about
internal hash position and reference counting feature.
In addition to that, it is _not_ intuitive that assignment as follows
$arr = array('a', 'b', 'c');
does not reset hash posiiton, while following assignment does reset
hash position.
$arr2 = $arr1;
Anyway, some internal hash posision behaviors are inconsistent and
_not_ intuitive at all. This would be really hard to find if a user
experience the problem. Therefore, it should be documented :)
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The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/16227
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Edit this bug report at http://bugs.php.net/?id=16227&edit=1
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