How to write loops in Smarty templates

How to write loops in Smarty templates
A half-day tutorial was studied, as if all the loops were for the incoming array

My question is this:
In an incoming array, 8 elements are named from I0 to i7, and now the 8 elements need to be processed
Because this array also contains other elements, it cannot be recycled for arrays
I think it's something like this.
for ($i =0; $i < 8; $i + +)
{
echo $arr ["i$i"];
}
I embed this PHP code in Smarty, and the result seems to be to get the variable $arr, resulting in no output.

Do not know this in the smarty how to achieve, please expert guidance

------Solution--------------------
There's another way of thinking. You can write the array on the PHP page, which is i0-i7, and then loop through the array, where the data is printed.
Like the array you passed is $i.

PHP code

{foreach from= $i item=item}{$arr [$item]} 
 
---  ---solution--------------------
 
   
   

    
     PHP code 
    
    
foreach (from= $arr; Key=k item=v) {key: {$k}: value {$v}} 
------solution--------------------
 {section name= "fooo" loop= $new _re_j} 
 {$new _re _id[fooo]} 
 {/section} 
 
------solution--------------------
 Nesting loops in Smarty 
------ Solution--------------------
 Section foreach Loop; 
 
------Solution--------------------
 {foreach from= $i item= Item} 
 {$arr [$item]} 
 
 
 
 
------Solution--------------------
 Why do you do it in Smarty? Is it better to finish working in PHP and then output array display? 
------Solution--------------------
 Smarty templates are typically looped with foreach 
 
 {{foreach from= $test key=key item=i}} 


 {{/foreach}} 
 