#40654 [NEW]: reference causes foreach to fail proper iteration

[saeven at saeven dot net]

From: saeven at saeven dot net
Operating system:
PHP version: 5.2.1
PHP Bug Type: Scripting Engine problem
Bug description: reference causes foreach to fail proper iteration

Description:
------------
Using a reference to build an array, later causes foreach to fail when
reusing the reference variable name.

The bug is solved by adding unset( $element); before block B, but this
shouldn't be necessary.

Reproduce code:
---------------
// Block A - Build the Array
$a = array( 2 => array( "value" => "a" ),
4 => array( "value" => "b" ),
6 => array( "value" => "c" ) );

$b = array( "orange", "blue", "green" );

foreach( $a as $id => &$element ){
$extra = array();

foreach( $b as $color )
array_push( $extra, $color );

$element += array( 'extra' => $extra );
}

// Block B - Iterate through
foreach( $a as $element )
echo $element["value"].' ';


Expected result:
----------------
a b c

Actual result:
--------------
a b b

--
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[same at saeven dot net]

ID: 40654
Comment by: same at saeven dot net
Reported By: saeven at saeven dot net
Status: Open
Bug Type: Scripting Engine problem
PHP Version: 5.2.1
New Comment:

I'd add that print_r properly displays the constructed array, which
contradicts what foreach displays (which is why I thought this required
filing).


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

[2007-02-27 04:44:35] saeven at saeven dot net

Description:
------------
Using a reference to build an array, later causes foreach to fail when
reusing the reference variable name.

The bug is solved by adding unset( $element); before block B, but this
shouldn't be necessary.

Reproduce code:
---------------
// Block A - Build the Array
$a = array( 2 => array( "value" => "a" ),
4 => array( "value" => "b" ),
6 => array( "value" => "c" ) );

$b = array( "orange", "blue", "green" );

foreach( $a as $id => &$element ){
$extra = array();

foreach( $b as $color )
array_push( $extra, $color );

$element += array( 'extra' => $extra );
}

// Block B - Iterate through
foreach( $a as $element )
echo $element["value"].' ';


Expected result:
----------------
a b c

Actual result:
--------------
a b b


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


--
Edit this bug report at [url]http://bugs.php.net/?id=40654&edit=1[/url]

[tony2001@php.net]

ID: 40654
Updated by: [email]tony2001@php.net[/email]
Reported By: saeven at saeven dot net
-Status: Open
+Status: Bogus
Bug Type: Scripting Engine problem
PHP Version: 5.2.1
New Comment:

Duplicate of bug #29992.


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

[2007-02-27 05:00:30] same at saeven dot net

I'd add that print_r properly displays the constructed array, which
contradicts what foreach displays (which is why I thought this required
filing).

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

[2007-02-27 04:44:35] saeven at saeven dot net

Description:
------------
Using a reference to build an array, later causes foreach to fail when
reusing the reference variable name.

The bug is solved by adding unset( $element); before block B, but this
shouldn't be necessary.

Reproduce code:
---------------
// Block A - Build the Array
$a = array( 2 => array( "value" => "a" ),
4 => array( "value" => "b" ),
6 => array( "value" => "c" ) );

$b = array( "orange", "blue", "green" );

foreach( $a as $id => &$element ){
$extra = array();

foreach( $b as $color )
array_push( $extra, $color );

$element += array( 'extra' => $extra );
}

// Block B - Iterate through
foreach( $a as $element )
echo $element["value"].' ';


Expected result:
----------------
a b c

Actual result:
--------------
a b b


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


--
Edit this bug report at [url]http://bugs.php.net/?id=40654&edit=1[/url]