}
//empty linklist
public function emptyList()
{
$this->firstNode == NULL;
}
//insertion at index
public function insert($NewItem, $key)
{
if ($key == 0) {
$this->insertFirst($NewItem);
} else {
$link = new ListNode($NewItem);
$current = $this->firstNode;
$previous = $this->firstNode;
for ($i = 0; $i < $key; $i++) {
$previous = $current;
$current = $current->next;
}
$previous->next = $link;
$link->next = $current;
$this->count++;
}
}
}
$obj = new LinkList();
$obj->insertFirst($value);
$obj->insert($value, $key);
// at any index
$obj->deleteNode($value);
$obj->readList();
