Re: enhanced foreach loops

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

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?
>>
>


-- 
Kerry Wilson
Lead Developer
Williams Web
[email protected] | 423.485.4747

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