[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
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex
and a foreach would be much easier to read.
Thanks in advance for your answers
Sabine
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Re: [PHP] Assign values in foreach-loop
Sabine wrote:
Hello to all,
is it possible to assign values to the array for which I do the
foreach-loop?
foreach ($_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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Re: [PHP] Assign values in foreach-loop
Hello,
You simply need the $key variable, then you can set a new value for
$arr[$key] for each array element:
?php
$arr = array(1, 2, 3, 4);
foreach ($arr as $key = $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.
?php
$arr = array(1, 2, 3, 4);
foreach ($arr as $value) {
$value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
?
Jordan
On Sep 7, 2005, at 12:14 PM, Sabine wrote:
Hello to all,
is it possible to assign values to the array for which I do the
foreach-loop?
foreach ($_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 $_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit
complex and a foreach would be much easier to read.
Thanks in advance for your answers
Sabine
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Re: [PHP] Assign values in foreach-loop
Yeah, you can assign values, but you have to keep track of keys, so you'll want
to use the = operator for foreach (pardon my reformatted, I feel naked without
my braces):
foreach ($_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
$_SESSION['arr1'] . Is that right?
Surely I can do it with a for-loop, but those arrays are a bit complex
and a foreach would be much easier to read.
Thanks in advance for your answers
Sabine
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Re: [PHP] Assign values in foreach-loop
sorry,
i didn't fully answer the questions... if i understand your
multidimensional array correctly, your code should be something like:
foreach ($_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']) {
$arr1['selected'] = true;
}
} }
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[PHP] Assign values in foreach-loop: Problem solved
Thanks a lot for your fast answers,
I'll do it like -TG and Jordan in his last post suggested!
Sabine
Original-Nachricht
Betreff:[PHP] Assign values in foreach-loop
Datum: Wed, 07 Sep 2005 19:14:40 +0200
Von:Sabine [EMAIL PROTECTED]
Antwort an: [EMAIL PROTECTED]
An: PHP general php-general@lists.php.net
Hello to all,
is it possible to assign values to the array for which I do the
foreach-loop?
foreach ($_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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To unsubscribe, visit: http://www.php.net/unsub.php
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Re: [PHP] Assign values in foreach-loop
Jordan Miller wrote:
Hello,
You simply need the $key variable, then you can set a new value for
$arr[$key] for each array element:
?php
$arr = array(1, 2, 3, 4);
foreach ($arr as $key = $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.
?php
$arr = array(1, 2, 3, 4);
foreach ($arr as $value) {
$value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
?
Jordan
Or you can do it like that...
Totally brain-faded on the $key bit. I've been bitten by this so many
times that it's just in my head that you can't permanently modify the array.
Cool stuff on the v5 referencing, I guess I'm gonna have to go back
through the manual on everything and not just the new stuff.
Thanks!
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Re: [PHP] Assign values in foreach-loop
- Original Message -
From: Sabine [EMAIL PROTECTED]
To: PHP general php-general@lists.php.net
Sent: Wednesday, September 07, 2005 7:14 PM
Subject: [PHP] Assign values in foreach-loop
Hello to all,
is it possible to assign values to the array for which I do the
foreach-loop?
foreach ($_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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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
$_SESSION['arr1'] . Is that right?
I might add that is not always a good thing to use true or false with
sessions. Use 1 and 0 instead. (or two diffrent numbers or anything else but
true or false)
/G
http://www.varupiraten.se/
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Re: [PHP] Assign values in foreach-loop
In case it hasnt been said already, as long as your array has numeric and
consecutive keys, you could use 'for' instead of 'foreach'.
Jason
On 9/7/05, Gustav Wiberg [EMAIL PROTECTED] wrote:
- Original Message -
From: Sabine [EMAIL PROTECTED]
To: PHP general php-general@lists.php.net
Sent: Wednesday, September 07, 2005 7:14 PM
Subject: [PHP] Assign values in foreach-loop
Hello to all,
is it possible to assign values to the array for which I do the
foreach-loop?
foreach ($_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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To unsubscribe, visit: http://www.php.net/unsub.php
--
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/
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Re: [PHP] Assign values in foreach-loop
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 php-general@lists.php.net 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/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
