#42306 [Opn->Asn]: current/next/prev/key usage on the same array as foreach() is looping
| From: | jani@php.net | Date: | Wed, 15 Aug 2007 10:32:07 +0000 |
| Subject: | #42306 [Opn->Asn]: current/next/prev/key usage on the same array as foreach() is looping | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-116104@lists.php.net to get a copy of this message | ||
ID: 42306
Updated by: jani@php.net
Reported By: hannes dot magnusson at gmail dot com
-Status: Open
+Status: Assigned
Bug Type: Arrays related
Operating System: Linux/Ubuntu 7.04
PHP Version: 5CVS-2007-08-15 (CVS)
-Assigned To:
+Assigned To: dmitry
New Comment:
<?php
$a = range('a', 'f');
echo "without reference:\n";
foreach($a as $b) {
echo key($a), ' - ', current($a), "\n";
}
echo "with reference:\n";
foreach($a as &$b) {
echo key($a), ' - ', current($a), "\n";
}
?>
Output:
without reference:
1 - b
1 - b
1 - b
1 - b
1 - b
1 - b
with reference:
1 - b
2 - c
3 - d
4 - e
5 - f
-
Previous Comments:
------------------------------------------------------------------------
[2007-08-15 09:19:53] hannes dot magnusson at gmail dot com
Description:
------------
If I use current/next/prev/key() on the same array as foreach() is
currently looping over the internal pointer is only increased on the
first iteration.
However. If I compare the value ($b) to something before using
current/next/prev/key() I get the expected results:
$a = range(0, 10);
foreach($a as $b) {
if($b == 5) {
var_dump(current($a)); // int(6)
}
}
Reproduce code:
---------------
<?php
$a = range(0, 10);
foreach($a as $b) {
var_dump(current($a));
if($b == 5) {
var_dump(current($a));
}
}
Expected result:
----------------
int(1)
int(2)
int(3)
int(4)
int(5)
int(6) // The var_dump() inside the if()
int(6)
int(7)
int(8)
int(9)
int(10)
bool(false) // Since the internal pointer points beyond the end
Actual result:
--------------
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
int(1)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=42306&edit=1