How to use a dynamic smarty variable in foreach loop - variables

Question

Can anyone tell me how to use dynamic variables in smarty foreach loop. I am trying to create a module in prestashop and m very close to get it done.
here's my code:
//file name index.php
foreach( $subCategories as $s )
{
$foo = intval($s['id_category']);
$k = new Category($foo);
$var1 = "subSubCategories.$foo";
$var1 = $k->getSubCategories(1);
$smarty->assign(array('foo'.$foo => $var1));
}
//file name:index.tpl
{assign var=foo value=$foo$cat}
//where $cat is a variable that counts the number of categories
{if isset($foo) AND $foo}
{foreach from=$foo item=subCategories name=homesubCategories}
<p>{$subCategories.name}</p>
{/foreach}
{else}
<p>{l s='test failed'}</p>
{/if}
I've exhausted all of my resources and knowledge and feeling quite helpless at this moment. so plz help me out.
I am trying to create dynamic variables ('foo'.$foo i.e. foo1, foo2, and so on) depending on the number of sub-categories. I think m successful up to this point. Now moving on to the tpl file, here I want to access the dynamically created variable (foo2, foo3 etc.) using foreach. Now if I am doing this: {assign var=foo value=$foo3} I succeed in fetching the values from this subcategory using the same foreach loop. But when I do this: {assign var=foo value=$foo$catx} (where $catx stores the values for category id) it fails. Please help.

Answer 1

I use such code in section loop (for Smarty 2):
{section name=buildings loop=7 start=1 step=1 max=7}
<tr>
{assign var=part_number value="part`$smarty.section.buildings.index`_number"}
<td class="number">
<input class="number xshort" name="part{$smarty.section.buildings.index}_number" value="{$data.$part_number}" type="text">
</td>
</tr>
{/section}
As you can see, there are a creation of dynamic variable part_number (see backticks in value block). And then, you can use it as value="{$data.$part_number}".

Answer 2

Your $smarty->assign() call is incorrect; you've only got one parameter being sent to it, but it needs two parameters (the variable name, followed by the value). Based on your template code (looping through variable $foo), your loop should be something like this in PHP:
//file name index.php
$subcats = array();
foreach($subCategories as $s) {
$foo = intval($s['id_category']);
$k = new Category($foo);
$subcats[$foo] => $k->getSubCategories(1);
}
$smarty->assign('foo', $subcats);
Then it also looks like you're not using the Smarty {foreach} quite properly either. You're declaring the name attribute, of the foreach loop, but then not using it properly. Assuming $k->getSubCategories(1) returns a string, the smarty code would just have to be:
{foreach from=$foo item=subCategories}<p>{$subCategories}</p>{/foreach}
If $k->getSubCategories(1) returns an array with a 'homesubCategories' element (which is what I think you're trying to get at with your Smarty code), you still don't need the 'name' value on the foreach. You'd then just do:
{foreach from=$foo item=subCategories}<p>{$subCategories.homesubCategories}</p>{/foreach}

Answer 3

With $foo = intval($s['id_category']); you defined $foo as an integer.
Then you concat the string with $smarty->assign(array('foo'.**$foo** => $var1));
Correct is:
$foo = $s['id_category'];
$smarty->assign(array('foo'.$foo => $var1));

Answer 4

Dynamically named variables are generally a very bad design choice, making everything much more difficult than it needs to be.
If you have a set of elements you need to loop over or index into, put them in an array; then you don't need to do any magic assignments, as you can use normal foreach loops or array key access:
//file name index.php
// Build the array first, then assign it to Smarty at the end
$foo_array = array();
foreach($subCategories as $s)
{
$foo = intval($s['id_category']);
$k = new Category($foo);
// This line is redundant as you over-write on the following line:
// $var1 = "subSubCategories.$foo";
$var1 = $k->getSubCategories(1);
$foo_array[ $foo ] = $var1;
}
// Assigning one variable, so just pass name and value to $smarty->assign()
$smarty->assign('foo_array', $foo_array);
//file name:index.tpl
{* Look for the entry in the outer array with key "$cat", then loop over it *}
{foreach from=$foo_array[$cat] item=subCategories}
<p>{$subCategories.name}</p>
{/foreach}

Answer 5

it's possible to call variable dynamically created in template with this statement:
if for example $index = 2
{$foo{$index}}
then this will call variable with name {$foo2}