Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Sabine 

Thanks, Gustav for your answer.

I already solved my problem (see below) with help of other members of 
the list.

Gustav Wiberg schrieb:



- Original Message - From: "Sabine" <[EMAIL PROTECTED]>
To: "PHP general" 
Sent: Wednesday, September 07, 2005 7:14 PM
Subject: [PHP] Assign values in foreach-loop



I might add that is not always a good thing to use true or false with 
sessions. Use 1 and 0 instead. (or two diffrent numbers or anything 
else but true or false)


Why? What is wrong with using true or false with sessions? What may happen?

Sabine



/G
http://www.varupiraten.se/



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Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Jason Davidson 
In case it hasnt been said already, as long as your array has numeric and 
consecutive keys, you could use 'for' instead of 'foreach'. 

Jason

On 9/7/05, Gustav Wiberg <[EMAIL PROTECTED]> wrote:
> 
> 
> - Original Message -
> From: "Sabine" <[EMAIL PROTECTED]>
> To: "PHP general" 
> Sent: Wednesday, September 07, 2005 7:14 PM
> Subject: [PHP] Assign values in foreach-loop
> 
> 
> > Hello to all,
> >
> > is it possible to assign values to the array for which I do the
> > foreach-loop?
> >
> > foreach ($_SESSION['arr1'] as $arr1) {
> > foreach ($_SESSION['arr2'] as $arr2) {
> > if ($arr1['id'] == $arr2['id']) {
> > $arr1['selected'] = true;
> > }
> > } }
> >
> > I think $arr1 is only a temp-var, so the assignment won't reflect on
> > $_SESSION['arr1'] . Is that right?
> > Surely I can do it with a for-loop, but those arrays are a bit complex 
> and
> > a foreach would be much easier to read.
> >
> > Thanks in advance for your answers
> > Sabine
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
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> >
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG Anti-Virus.
> > Version: 7.0.344 / Virus Database: 267.10.18/91 - Release Date: 
> 2005-09-06
> >
> >
> Hi there!
> 
> Why not set $_SESSION['arr1'] = true ?
> 
> > foreach ($_SESSION['arr1'] as $arr1) {
> > foreach ($_SESSION['arr2'] as $arr2) {
> > if ($arr1['id'] == $arr2['id']) {
> > $_SESSION['arr1'] = true;
> > }
> > } }
> >
> > I think $arr1 is only a temp-var, so the assignment won't reflect on
> > $_SESSION['arr1'] . Is that right?
> 
> I might add that is not always a good thing to use true or false with
> sessions. Use 1 and 0 instead. (or two diffrent numbers or anything else 
> but
> true or false)
> 
> /G
> http://www.varupiraten.se/
> 
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
> 
>

Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Gustav Wiberg 


- Original Message - 
From: "Sabine" <[EMAIL PROTECTED]>

To: "PHP general" 
Sent: Wednesday, September 07, 2005 7:14 PM
Subject: [PHP] Assign values in foreach-loop



Hello to all,

is it possible to assign values to the array for which I do the 
foreach-loop?


foreach ($_SESSION['arr1'] as $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $arr1['selected'] = true;
   }
   }   }

I think $arr1 is only a temp-var, so the assignment won't reflect on 
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex and 
a foreach would be much easier to read.


Thanks in advance for your answers
Sabine

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Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.10.18/91 - Release Date: 2005-09-06



Hi there!

Why not set $_SESSION['arr1'] = true ?


foreach ($_SESSION['arr1'] as $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $_SESSION['arr1'] = true;
   }
   }   }

I think $arr1 is only a temp-var, so the assignment won't reflect on 
$_SESSION['arr1'] . Is that right?


I might add that is not always a good thing to use true or false with 
sessions. Use 1 and 0 instead. (or two diffrent numbers or anything else but 
true or false)


/G
http://www.varupiraten.se/

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Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Edward Vermillion 

Jordan Miller wrote:

Hello,

You simply need the $key variable, then you can set a new value for  
$arr[$key] for each array element:

 $value) {
   $arr[$key] = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
?>


http://www.php.net/foreach
If you have PHP 5, you can perhaps more efficiently do this:


As of PHP 5, you can easily modify array's elements by preceding  
$value with &. This will assign reference instead of copying the  value.









Jordan


Or you can do it like that...

Totally brain-faded on the $key bit. I've been bitten by this so many 
times that it's just in my head that you can't permanently modify the array.


Cool stuff on the v5 referencing, I guess I'm gonna have to go back 
through the manual on everything and not just the new stuff.


Thanks!

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[PHP] Assign values in foreach-loop: Problem solved

2005-09-07 Thread Sabine 

Thanks a lot for your fast answers,

I'll do it like -TG and Jordan in his last post suggested!

Sabine

 Original-Nachricht 
Betreff:    [PHP] Assign values in foreach-loop
Datum:  Wed, 07 Sep 2005 19:14:40 +0200
Von:Sabine <[EMAIL PROTECTED]>
Antwort an: [EMAIL PROTECTED]
An: PHP general 



Hello to all,

is it possible to assign values to the array for which I do the 
foreach-loop?


foreach ($_SESSION['arr1'] as $arr1) {
  foreach ($_SESSION['arr2'] as $arr2) {
  if ($arr1['id'] == $arr2['id']) {
  $arr1['selected'] = true;
  }
  }   
}


I think $arr1 is only a temp-var, so the assignment won't reflect on 
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex 
and a foreach would be much easier to read.


Thanks in advance for your answers
Sabine

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Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Jordan Miller 

sorry,

i didn't fully answer the questions... if i understand your  
multidimensional array correctly, your code should be something like:


foreach ($_SESSION['arr1'] as $key => $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $_SESSION['arr1'][$key]['selected'] = true;
   }
   }   }

Jordan



On Sep 7, 2005, at 12:22 PM, Jordan Miller wrote:


foreach ($_SESSION['arr1'] as $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $arr1['selected'] = true;
   }
   }   }




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Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread tg-php 
Yeah, you can assign values, but you have to keep track of keys, so you'll want 
to use the => operator for foreach (pardon my reformatted, I feel naked without 
my braces):

foreach ($_SESSION['arr1'] as $key1 => $arr1)  {
foreach ($_SESSION['arr2'] as $key2 => $arr2) {
if ($arr1['id'] == $arr2['id']) {
# $arr1['selected'] = true;
$_SESSION['arr1'][$key1]['selected'] = true;
}
}
}

Is that what you were trying to do?

-TG




= = = Original message = = =

Hello to all,

is it possible to assign values to the array for which I do the 
foreach-loop?

foreach ($_SESSION['arr1'] as $arr1) 
foreach ($_SESSION['arr2'] as $arr2) 
if ($arr1['id'] == $arr2['id']) 
$arr1['selected'] = true;

   


I think $arr1 is only a temp-var, so the assignment won't reflect on 
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex 
and a foreach would be much easier to read.

Thanks in advance for your answers
Sabine

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Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Jordan Miller 

Hello,

You simply need the $key variable, then you can set a new value for  
$arr[$key] for each array element:

 $value) {
   $arr[$key] = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
?>


http://www.php.net/foreach
If you have PHP 5, you can perhaps more efficiently do this:


As of PHP 5, you can easily modify array's elements by preceding  
$value with &. This will assign reference instead of copying the  
value.









Jordan




On Sep 7, 2005, at 12:14 PM, Sabine wrote:




Hello to all,

is it possible to assign values to the array for which I do the  
foreach-loop?


foreach ($_SESSION['arr1'] as $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $arr1['selected'] = true;
   }
   }   }

I think $arr1 is only a temp-var, so the assignment won't reflect  
on $_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit  
complex and a foreach would be much easier to read.


Thanks in advance for your answers
Sabine

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Re: [PHP] Assign values in foreach-loop

2005-09-07 Thread Edward Vermillion 

Sabine wrote:

Hello to all,

is it possible to assign values to the array for which I do the 
foreach-loop?


foreach ($_SESSION['arr1'] as $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $arr1['selected'] = true;
   }
   }   }

I think $arr1 is only a temp-var, so the assignment won't reflect on 
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex 
and a foreach would be much easier to read.


Thanks in advance for your answers
Sabine



Short answer is no.

foreach works on a copy of the array, so any chnges you make inside the 
foreach loop are "lost" once you're outside of it. Although *inside* the 
foreach the changes *are* valid.


What you can do is:

$newArray = array();

foreach ($_SESSION['arr1'] as $arr1) {
foreach ($_SESSION['arr2'] as $arr2) {
if ($arr1['id'] == $arr2['id']) {
$newArray['selected'] = true;
}
}   }

Then reference $newArray instead of $arr1.

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[PHP] Assign values in foreach-loop

2005-09-07 Thread Sabine 

Hello to all,

is it possible to assign values to the array for which I do the 
foreach-loop?


foreach ($_SESSION['arr1'] as $arr1) {
   foreach ($_SESSION['arr2'] as $arr2) {
   if ($arr1['id'] == $arr2['id']) {
   $arr1['selected'] = true;
   }
   }   
}


I think $arr1 is only a temp-var, so the assignment won't reflect on 
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex 
and a foreach would be much easier to read.


Thanks in advance for your answers
Sabine

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