Re: [PHP] modifying within foreach
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On Tue, Jun 23, 2009 at 4:25 PM, Robert Cummings wrote:
> 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
>>> Sheridan wrote:
>>>
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
> Andres Gonzalez 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
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>> 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
>
> --
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>
>
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Martin Scotta
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
Sheridan wrote:
> On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
>> Andres Gonzalez 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
>
>
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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
Sheridan wrote:
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
Andres Gonzalez 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
--
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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
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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
> Sheridan wrote:
> > On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
> >> Andres Gonzalez 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/)
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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 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
> >>
> >>
> >
> >
> >
>
> --
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Re: [PHP] modifying within foreach
On Tue, 2009-06-23 at 12:56 -0600, kirk.john...@zootweb.com wrote:
> Andres Gonzalez 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
Andres Gonzalez 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
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 $results? Or am I just going against the grain here?
-Andres
--
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To unsubscribe, visit: http://www.php.net/unsub.php
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RE: [PHP] modifying within foreach
foreach ($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 $results? Or am I just going against the grain here?
>
> -Andres
>
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
--
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To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] modifying within foreach
In the following example:
foreach ($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
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