Find length of circular linked list in php

Php program for Find length of circular linked list . Here more information.

<?php
// Php program for
// Count number of nodes in circular linked list 

// Define class of linked list Node
class LinkNode
{
	public $data;
	public $next;
	public	function __construct($data, $first)
	{
		$this->data = $data;
		$this->next = $first;
	}
}
class CircularLinkedList
{
	public $head;
	// Class constructor
	public	function __construct()
	{
		$this->head = NULL;
	}
	// Insert node at end of circular linked list
	public	function insert($value)
	{
		// Create a new node
		$node = new LinkNode($value, $this->head);
		if ($this->head == NULL)
		{
			// First node of linked list
			$this->head = $node;
			$node->next = $this->head;
		}
		else
		{
			$temp = $this->head;
			// Find the last node
			while ($temp->next != $this->head)
			{
				// Visit to next node
				$temp = $temp->next;
			}
			// Add new node at the last 
			$temp->next = $node;
		}
	}
	public	function countNode()
	{
		if ($this->head == NULL)
		{
			return 0;
		}
		// Start with second node
		$temp = $this->head->next;
		// This is used to count linked node
		$count = 1;
		// iterate circular linked list
		while ($temp != $this->head)
		{
			$count += 1;
			// Visit to next node
			$temp = $temp->next;
		}
		return $count;
	}
	public static
	function main($args)
	{
		$cll = new CircularLinkedList();
		// Add nodes
		$cll->insert(1);
		$cll->insert(3);
		$cll->insert(5);
		$cll->insert(7);
		$cll->insert(9);
		$cll->insert(11);
		// Display result
		printf("%d\n", $cll->countNode());
	}
}

CircularLinkedList::main(array());

Output

6