Re: enhanced foreach loops

Kerry Wilson wrote:
> False or null is fine with me.  I am working on it and here is the 
> problems I have found.  I am trying to use the prev and next functions, 
> these move the internal pointer on the array.  They behave differently 
> whether the array in the foreach is a reference or not:
> 
> $array = array( 'a' => 'a', 'b' => 'b', 'c' => 'c' );
> $_from = $array;
> foreach( $_from AS $key => $value ) {
>  $element = current($_from);
>  echo $element;
> }
> 
> will print aaa, since the internal cursor of _from will not be moved and 
> a will be the current one
> 
> where as:
> $_from = &$array;
> 
> will print abc, b/c the internal cursor is moved
no, it does not, it prints out "bc " as in the loop current() is already 
the next one.

I really wonder what such "enhancement" can serve.
-- 
toggg
> 
> so for next and previous methods to work with smarty the _from 
> assignment will have to be changed to reference ( & ) and we have to be 
> careful not to move pointer ( php doesn't have method for 'peeking' 
> ahead? )
> 
> prev($_from); // Rewind b/c current is really the next element
> $previous = prev($_from); // This assigns previous
> next($_from); // Now we are back to previous
> next($_from); // Now we are back to current
> $next = next($_from);  // Get next
> prev($_from); // move back to current
> 
> wow all that just to get the neighboring values, anyone know a better way?
> 
> 
> Ken Snyder wrote:
>> Very interesting idea... You could do {assign var=previous_call 
>> value=$message.backtrace[$smarty.foreach.backtrace.index + 1]} but it 
>> wouldn't work for associative arrays or objects.  I like it!  What 
>> would be the desired behavior of $smarty.foreach.NAME.next when on the 
>> last item?  A default value? NULL?
>>
>> --Ken
>>
>> Kerry Wilson wrote:
>>> I would like to enhance the foreach loop by adding next and previous 
>>> to the foreach variables.
>>>
>>> Example usage:
>>>
>>> {foreach from=$message.backtrace item='call' name='backtrace'}
>>>  {assign var='previous_call' value=|$smarty.foreach.backtrace.next}|
>>>  <li style='list-style: none;'>{$call.file} [{$call.line}] - 
>>> {$previous_call.class}.{$previous_call.function}(){/if}</li>
>>> {/foreach}
>>>
>>> In case you cannot tell I am using this to print a backtrace ( I want 
>>> it to show the method it is currently in, not the one that it is 
>>> calling ).
>>>
>>> Where does the foreach implementation reside in source?  And is this 
>>> a good thing to add to the base code?
>>>
>>
> 
> 

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