} else {
if ($temp->next === NULL && $temp->prev != NULL) {
$node->prev = $temp->prev;
$node->next = $temp;
$temp->prev = $node;
} else {
if ($temp->prev != NULL && $temp->next != NULL) {
$temp->prev->next = $node;
$node->prev = $temp->prev;
$temp->prev = $node;
$node->next = $temp;
}
}
}
}
}
}
$node1 = new Node(3);
$node2 = new Node(10);
$node3 = new Node(20);
$node4 = new Node(50);
$node5 = new Node(99);
$node6 = new Node(30);
$station1 = new Station();
$station1->add_node($node1);
$station1->add_node($node2);
$station1->add_node($node3);
$station1->add_node($node4);
$station1->add_node($node5);
$station1->insert_node($node6, 5);
var_dump($station1);
