down.php

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<?php
$Module   = $Params['Module'];
$NodeID = $Params['NodeID'];
$UserID   = $Params['UserID'];

if ($UserID)
  $userObject = eZUser::fetch($UserID);
else
  $userObject = eZUser::currentUser();


$children = eZContentObjectTreeNode::subTreeByNodeID( array('SortBy'=>array('priority',true)),
                                                                  $userObject->contentObject()->mainNodeID() );

$priorityIDArray = array_map(function($n){return $n->NodeID;}, $children);

$p= array_search($NodeID, $priorityIDArray);

if ($p > 0){
  $tmp = $priorityIDArray[$p];
  $priorityIDArray[$p] = $priorityIDArray[$p-1];
  $priorityIDArray[$p-1] = $tmp;
}
$priorityArray = array_keys($priorityIDArray);
var_dump($priorityIDArray);


eZContentOperationCollection::updatePriority($NodeID, $priorityArray, $priorityIDArray);
eZContentCacheManager::clearContentCacheIfNeeded( eZContentObjectTreeNode::fetch($NodeID)->ContentObjectID );