Updating an array key value

[Phaelon]

Hi all,

I have made the following variable with arrays:

$_SESSION['cart']['content'] = array(
    array(number => 1, sizes => 1)
    ,
    array(number => 2, sizes => 1)
);

Can someone please tell me how I can update the key 'sizes' where 'number = 2' without it touching anything else?

[Phaelon]

To further explain on what I am trying to do, in MySQL I would do the equivilent of something along the lines of:

 

 

UPDATE content SET sizes = 2 WHERE number = 2;

 

I'm basically wanting to do the same, but for an array in a PHP session.

 

Perhaps I have engineered my session and array wrong for a cart system?

[davidannis]

foreach ($_SESSION['cart']['content'] as $key=>$value){
     if ($value==2){
              $_SESSION['cart']['content'][$key]=2;
}
}

I'd try something like this

Edited May 7, 2014 by davidannis

[mac_gyver]

did you read the latest reply in your previous thread?
 
if the 'number' element you are showing represents the item number and you are going to need to reference the entries in the cart by their item number, use the item number as an array index, not as a separate element in the stored array.
 
once you do that, your code would be - $_SESSION['cart']['content'][2]['sizes'] = 2;

[Phaelon]

Thanks davidannis, I tried your suggestion, but it didn't work.

 

$_SESSION['cart']['content'] = array(
    array(number => 1, sizes => 1)
    ,
    array(number => 2, sizes => 1)
);
foreach ($_SESSION['cart']['content'] as $content) {
    echo 'PRODUCT NUMBER: '.$content['number'].'<BR>';
    if (isset($content['sizes'])) {echo 'SIZE S: '.$content['sizes'].'<BR>';}
    if (isset($content['sizem'])) {echo 'SIZE M: '.$content['sizem'].'<BR>';}
    echo '<BR>';
}

foreach ($_SESSION['cart']['content'] as $key=>$value){
if ($value==2){
$_SESSION['cart']['content'][$key]=2;
}
}

foreach ($_SESSION['cart']['content'] as $content) {
    echo 'PRODUCT NUMBER: '.$content['number'].'<BR>';
    if (isset($content['sizes'])) {echo 'SIZE S: '.$content['sizes'].'<BR>';}
    if (isset($content['sizem'])) {echo 'SIZE M: '.$content['sizem'].'<BR>';}
    echo '<BR>';
}

 

 

Thank you for the information mac_gyver. I just tried to do that, but it didn't work:

 

$_SESSION['cart']['content'] = array(
    array(number => 1, sizes => 1)
    ,
    array(number => 2, sizes => 1)
);
foreach ($_SESSION['cart']['content'] as $content) {
    echo 'PRODUCT NUMBER: '.$content['number'].'<BR>';
    if (isset($content['sizes'])) {echo 'SIZE S: '.$content['sizes'].'<BR>';}
    if (isset($content['sizem'])) {echo 'SIZE M: '.$content['sizem'].'<BR>';}
    echo '<BR>';
}

$_SESSION['cart']['content'][2]['sizes'] = 2;

foreach ($_SESSION['cart']['content'] as $content) {
    echo 'PRODUCT NUMBER: '.$content['number'].'<BR>';
    if (isset($content['sizes'])) {echo 'SIZE S: '.$content['sizes'].'<BR>';}
    if (isset($content['sizem'])) {echo 'SIZE M: '.$content['sizem'].'<BR>';}
    echo '<BR>';
}

Edited May 7, 2014 by Phaelon

[adam_bray]

Thank you for the information mac_gyver. I just tried to do that, but it didn't work:

 

It didn't work because you didn't do what he suggested, you jumped to the end without changing anything.

 

 

 

Perhaps I have engineered my session and array wrong for a cart system?

Yes^

 

You need to take the number variable out of the final array and use it as an array key. 

 

Here's an example -

<?php

	// Array to store the shopping cart
	$cart = array();

	// Products that are available
	// Product_id => array of product info
	// Could be from database instead
	$products = array(
		// Product 1
		1		=>		array(
			'size'		=>		'L',
			'available'	=>		3,
			'price'		=>		'4.00',
		),
		// Product 2
		2		=>		array(
			'size'		=>		'XL',
			'available'	=>		8,
			'price'		=>		'4.00',
		),
		// Product 3
		3		=>		array(
			'size'		=>		'S',
			'available'	=>		1,
			'price'		=>		'3.50',
		),
	);
	
	// If a product id has been set
	if( isset( $_GET['pid'] ) )
	{
		// Add the product to your cart variable
		$cart[$_GET['pid']][] = $products[$_GET['pid']];
		
		// Tell the user what they've added
		print 'You have added a shirt in '.$cart[$_GET['pid']]['size'].' for $'.$cart[$_GET['pid']]['price'].' to your cart.';
		
		// Store in session
		// Check it isn't already in the cart
		// Etc...
	}
?>

[davidannis]

Oops, the line:

if ($value==2){

should have been

if ($value['number']==2){

I haven't seen the previous thread but mac_gyver is right that you should take out number if it is just a key and use it as such. I assumed number was a product number, isbn number, or something like that.