PHP linked list creation and traversal

<?php

#php Linked list creation and traversal 

/** * Class node *  Linked list node element  */
class node
{
    
    public $item; # The current node stores elements 
    public $next; # Point to the address of the next node 

    public function __construct($item, $next = null)
    {
    
        $this->item = $item;
        $this->next = $next;
    }
}

$node1 = new node(1);
$node2 = new node(2);
$node3 = new node(3);

$node1->next = $node2;
$node2->next = $node3;

#var_dump($node1);

#  The first interpolation 
function create_link_list_head($arr = [])
{
    
    $head = new node($arr[0]); #  Head node 
    for ($i = 1; $i < count($arr); $i++) {
    
        $node = new node($arr[$i]);
        $node->next = $head; # The next node of the current node refers to the head node 
        $head = $node; # The current node is moved to the head node 
    }

    return $head;
}

$lk = create_link_list_head([1, 2, 3, 4, 5]);
print_link_list($lk);
echo "\n";

#  Traverse and print linked list elements 
/** * @param $link_list node */
function print_link_list($link_list)
{
    
    while ($link_list) {
    
        print($link_list->item . ",");
        $link_list = $link_list->next;
    }
}


#  The tail interpolation 
function create_link_list_tail($arr = [])
{
    
    $head = new node($arr[0]); #  Head node 
    $tail = $head; //  Tail node 
    for ($i = 1; $i < count($arr); $i++) {
    
        $node = new node($arr[$i]);
        $tail->next = $node; # The next node of the tail node points to the current node 
        $tail = $node; # Move the current node to the tail node 
    }

    return $head;
}

$lk = create_link_list_tail([1, 2, 3, 4, 5]);
print_link_list($lk);
echo "\n";