[PHP] modifying within foreach
In the following example:
foreach ($results as $key = $item) {
//bla bla bla -- unset some of the $items
}
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are ignored
on the next pass. Is this true?
If so, is there a way that I can tell the foreach statement to re-read the
array $results? Or am I just going against the grain here?
-Andres
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] modifying within foreach
foreach ($results as $key = $item)
{
if ($item == 'foo') unset($results[$key]);
}
-Original Message-
From: Andres Gonzalez [mailto:and...@packetstorm.com]
Sent: Tuesday, June 23, 2009 11:27 AM
To: php-general@lists.php.net
Subject: [PHP] modifying within foreach
In the following example:
foreach ($results as $key = $item) {
//bla bla bla -- unset some of the $items
}
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass,
are ignored
on the next pass. Is this true?
If so, is there a way that I can tell the foreach statement
to re-read the
array $results? Or am I just going against the grain here?
-Andres
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
I do not want to delete the whole array, only a particular $item.
given this $results array:
Array
(
[key1] = Array
(
[0] = value1
[1] = value2
[2] = value 3
(
[key2] = Array
(
[0] = value4
[1] = value5
[2] = value6
)
)
It is a value item that I want to delete based on a particular criteria.
In each pass I may delete a value item. However, it seems that each
subsequent pass operates on the original $results array and not
the modified one.
-Andres
Daevid Vincent wrote:
foreach ($results as $key = $item)
{
if ($item == 'foo') unset($results[$key]);
}
-Original Message-
From: Andres Gonzalez [mailto:and...@packetstorm.com]
Sent: Tuesday, June 23, 2009 11:27 AM
To: php-general@lists.php.net
Subject: [PHP] modifying within foreach
In the following example:
foreach ($results as $key = $item) {
//bla bla bla -- unset some of the $items
}
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass,
are ignored
on the next pass. Is this true?
If so, is there a way that I can tell the foreach statement
to re-read the
array $results? Or am I just going against the grain here?
-Andres
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38 PM: I want to modify $results within the foreach. In other words, during a given pass of this iteration, I want to delete some of the items based on particular conditions. Then on the next pass thru the foreach, I want $results to be the newer, modified array. This does not seem to work. It appears that the foreach statement is implemented such that $results is read into memory at the start so that any modifications I make to it during a given pass, are ignored on the next pass. Is this true? foreach works on a copy of an array, so the behavior you saw is expected. See the online manual. You could use a while loop, or, instead of unset-ing elements of $results, store the elements you want to keep into a new array. Kirk
Re: [PHP] modifying within foreach
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38 PM:
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are ignored
on the next pass. Is this true?
foreach works on a copy of an array, so the behavior you saw is expected.
See the online manual.
You could use a while loop, or, instead of unset-ing elements of $results,
store the elements you want to keep into a new array.
Kirk
What about passing it by reference?
foreach($results as $key = $item)
{
// modify items here
}
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] modifying within foreach
Dude. Use your common sense and the example I just provided:
foreach ($results as $key = $item)
{
if ($item == 'foo')
unset($results[$key]);
else ($item == 'bar')
$results[$key] = 'new value';
}
so using your example:
foreach ($results as $key = $item)
{
if ($item[0] == 'value1')
unset($results[$key][0]);
else ($item[0] == 'bar')
$results[$key][0] = 'value4';
}
But since you have a multidimensional array, you have to really do two loops
to be useful:
foreach ($results as $key = $item)
{
foreach ($item as $i = $value)
{
if ($value == 'value1')
unset($results[$key][$i])
else ($value == 'bar')
$results[$key][$i] = 'value4';
}
}
Or something to that effect, I just wrote that freehand, but you should get
the idea.
http://daevid.com
-Original Message-
From: Andres Gonzalez [mailto:and...@packetstorm.com]
Sent: Tuesday, June 23, 2009 11:45 AM
Cc: php-general@lists.php.net
Subject: Re: [PHP] modifying within foreach
I do not want to delete the whole array, only a particular $item.
given this $results array:
Array
(
[key1] = Array
(
[0] = value1
[1] = value2
[2] = value3
(
[key2] = Array
(
[0] = value4
[1] = value5
[2] = value6
)
)
It is a value item that I want to delete based on a
particular criteria.
In each pass I may delete a value item. However, it seems that each
subsequent pass operates on the original $results array and not
the modified one.
-Andres
Daevid Vincent wrote:
foreach ($results as $key = $item)
{
if ($item == 'foo') unset($results[$key]);
}
-Original Message-
From: Andres Gonzalez [mailto:and...@packetstorm.com]
Sent: Tuesday, June 23, 2009 11:27 AM
To: php-general@lists.php.net
Subject: [PHP] modifying within foreach
In the following example:
foreach ($results as $key = $item) {
//bla bla bla -- unset some of the $items
}
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass,
are ignored
on the next pass. Is this true?
If so, is there a way that I can tell the foreach statement
to re-read the
array $results? Or am I just going against the grain here?
-Andres
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
Thanks guys--passing by reference solved my problem. I was not aware
that the foreach statement works on a copy. This was explained in the
online documentation. Duh!!
Thanks again,
-Andres
Ashley Sheridan wrote:
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38 PM:
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are ignored
on the next pass. Is this true?
foreach works on a copy of an array, so the behavior you saw is expected.
See the online manual.
You could use a while loop, or, instead of unset-ing elements of $results,
store the elements you want to keep into a new array.
Kirk
What about passing it by reference?
foreach($results as $key = $item)
{
// modify items here
}
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
On Tue, 2009-06-23 at 15:07 -0400, Eddie Drapkin wrote:
It's just foreach($foo as $key = $item) { }
You can't assign the key by reference .
On Tue, Jun 23, 2009 at 3:04 PM, Ashley
Sheridana...@ashleysheridan.co.uk wrote:
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38 PM:
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are ignored
on the next pass. Is this true?
foreach works on a copy of an array, so the behavior you saw is expected.
See the online manual.
You could use a while loop, or, instead of unset-ing elements of $results,
store the elements you want to keep into a new array.
Kirk
What about passing it by reference?
foreach($results as $key = $item)
{
// modify items here
}
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Yeah, hehe, I was trying to remember off the top of my head, and
obviously forgot! :p
*slaps self*
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
Ashley Sheridan wrote:
On Tue, 2009-06-23 at 15:07 -0400, Eddie Drapkin wrote:
It's just foreach($foo as $key = $item) { }
You can't assign the key by reference .
On Tue, Jun 23, 2009 at 3:04 PM, Ashley
Sheridana...@ashleysheridan.co.uk wrote:
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38 PM:
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are ignored
on the next pass. Is this true?
foreach works on a copy of an array, so the behavior you saw is expected.
See the online manual.
You could use a while loop, or, instead of unset-ing elements of $results,
store the elements you want to keep into a new array.
Kirk
What about passing it by reference?
foreach($results as $key = $item)
{
// modify items here
}
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Yeah, hehe, I was trying to remember off the top of my head, and
obviously forgot! :p
*slaps self*
Your brain is in PHP4 mode...
*slaps Ashley*
:)
Cheers,
Rob.
--
http://www.interjinn.com
Application and Templating Framework for PHP
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
It's just foreach($foo as $key = $item) { }
You can't assign the key by reference .
On Tue, Jun 23, 2009 at 3:04 PM, Ashley
Sheridana...@ashleysheridan.co.uk wrote:
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38 PM:
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are ignored
on the next pass. Is this true?
foreach works on a copy of an array, so the behavior you saw is expected.
See the online manual.
You could use a while loop, or, instead of unset-ing elements of $results,
store the elements you want to keep into a new array.
Kirk
What about passing it by reference?
foreach($results as $key = $item)
{
// modify items here
}
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] modifying within foreach
AddBrainHandler x-httpd-php5 .php
On Tue, Jun 23, 2009 at 4:25 PM, Robert Cummings rob...@interjinn.comwrote:
Ashley Sheridan wrote:
On Tue, 2009-06-23 at 15:07 -0400, Eddie Drapkin wrote:
It's just foreach($foo as $key = $item) { }
You can't assign the key by reference .
On Tue, Jun 23, 2009 at 3:04 PM, Ashley
Sheridana...@ashleysheridan.co.uk wrote:
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez and...@packetstorm.com wrote on 06/23/2009 12:26:38
PM:
I want to modify $results within the foreach. In other words,
during a given pass of this iteration, I want to delete some
of the items based on particular conditions. Then on the next
pass thru the foreach, I want $results to be the newer, modified
array.
This does not seem to work. It appears that the foreach statement
is implemented such that $results is read into memory at the start
so that any modifications I make to it during a given pass, are
ignored
on the next pass. Is this true?
foreach works on a copy of an array, so the behavior you saw is
expected.
See the online manual.
You could use a while loop, or, instead of unset-ing elements of
$results,
store the elements you want to keep into a new array.
Kirk
What about passing it by reference?
foreach($results as $key = $item)
{
// modify items here
}
Thanks
Ash
www.ashleysheridan.co.uk
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Yeah, hehe, I was trying to remember off the top of my head, and
obviously forgot! :p
*slaps self*
Your brain is in PHP4 mode...
*slaps Ashley*
:)
Cheers,
Rob.
--
http://www.interjinn.com
Application and Templating Framework for PHP
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
Martin Scotta
