val = $val;
}
}*/
function Mirror(&$root)
{
if($root == NULL)
return 0;
$queue = array();
array_push($queue, $root);
while(!empty($queue)){
$node = array_shift($queue);
$tmp = $node->left;
$node->left = $node->right;
$node->right = $tmp;
if($node->left != NULL)
array_push($queue, $node->left);
if($node->right != NULL)
array_push($queue, $node->right);
}
}