correct use of type and argument collections

core/lib/Thelia/Core/Template/Smarty/Plugins/TheliaLoop.php

@@ -219,12 +219,7 @@ class TheliaLoop implements SmartyPluginInterface
     	$faultDetails = array();
 
         $argumentsCollection = $loop->defineArgs();
-        $argumentsCollection->rewind();
-
-        while ($argumentsCollection->valid()) {
-
-            $argument = $argumentsCollection->current();
-            $argumentsCollection->next();
+        foreach( $argumentsCollection as $argument ) {
 
             $value = isset($smartyParam[$argument->name]) ? $smartyParam[$argument->name] : null;
 

core/lib/Thelia/Type/TypeCollection.php

@@ -124,15 +124,10 @@ class TypeCollection implements \Iterator
      */
     public function isValid($value)
     {
-        $this->rewind();
-        while ($this->valid()) {
-            $type = $this->current();
-
+        foreach($this as $type) {
             if($type->isValid($value)) {
                 return true;
             }
-
-            $this->next();
         }
 
         return false;