How can PHP be used to dynamically update the order of items in a link list based on user input?

To dynamically update the order of items in a linked list based on user input in PHP, you can create a form where users can input the new order of items. Upon form submission, you can update the linked list structure accordingly by reordering the nodes based on the user's input. 

<?php

class Node {
    public $data;
    public $next;

    function __construct($data) {
        $this->data = $data;
        $this->next = null;
    }
}

class LinkedList {
    public $head;

    function __construct() {
        $this->head = null;
    }

    function insert($data) {
        $newNode = new Node($data);
        $newNode->next = $this->head;
        $this->head = $newNode;
    }

    function display() {
        $current = $this->head;
        while ($current != null) {
            echo $current->data . " ";
            $current = $current->next;
        }
    }

    function updateOrder($newOrder) {
        $current = $this->head;
        $index = 0;
        while ($current != null) {
            $current->data = $newOrder[$index];
            $current = $current->next;
            $index++;
        }
    }
}

// Create a linked list
$linkedList = new LinkedList();
$linkedList->insert(1);
$linkedList->insert(2);
$linkedList->insert(3);

// Display the current order
echo "Current order: ";
$linkedList->display();
echo "<br>";

// User input for new order
$newOrder = [3, 1, 2];

// Update the order based on user input
$linkedList->updateOrder($newOrder);

// Display the updated order
echo "Updated order: ";
$linkedList->display();

?>

Keywords

PHP dynamic update linked list user input

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