Linked List Operations in PHP

class ListNode {
    public $value;
    public $next;

    public function __construct($value) {
        $this->value = $value;  // Holds the value or data of the node
        $this->next = null;     // Points to the next node in the linked list; default is null
    }
}

// Initialization of linked list
class LinkedListExample {
    public static function main() {
        $head = new ListNode(1);
        $head->next = new ListNode(2);
        $head->next->next = new ListNode(3);
        $head->next->next->next = new ListNode(4);
        $head->next->next->next->next = new ListNode(5);
    }
}

class ListNode {
    public $value;
    public $next;

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

class ReverseLinkedList {
    public static function reverseLinkedList($head) {
        $prev = null;
        $current = $head;
        while ($current !== null) {
            $nextNode = $current->next;
            $current->next = $prev;
            $prev = $current;
            $current = $nextNode;
        }
        return $prev;
    }

    // Test
    public static function main() {
        $head = new ListNode(1);
        $head->next = new ListNode(2);
        $head->next->next = new ListNode(3);
        $head->next->next->next = new ListNode(4);
        $head->next->next->next->next = new ListNode(5);

        $reversedHead = self::reverseLinkedList($head);
        while ($reversedHead !== null) {
            echo $reversedHead->value . " ";
            $reversedHead = $reversedHead->next;  // Output: 5 4 3 2 1
        }
    }
}