/**
* Chain all nodes into an AND expression
* @param array $nodes
* @return epQueryNode
*/
private function _andNodes($nodes)
{
// if nodes array empty
if (!$nodes) {
// simply return it back
return $nodes;
}
// if only one node
if (1 == count($nodes)) {
// simply return it back
return $nodes[0];
}
// get the first node
$node_last = array_pop($nodes);
// consume nodes in array one by one
while ($node = array_pop($nodes)) {
// create an AND node
$and_node = new epQueryNode(EPQ_N_EXPR_LOGIC);
$and_node->setParam('op', 'AND');
// add last node and this node as children
$and_node->addChildren(array($node_last, $node));
$node_last = $and_node;
}
return $node_last;
}
