مقدمه ای به لیست های مرتبط در PHP: راهنمای مبتدی

class Node {
    public $data;
    public $next;

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

class LinkedList {
    private $head;

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

    public function append($data) {
        $newNode = new Node($data);
        if ($this->head === null) {
            $this->head = $newNode;
        } else {
            $current = $this->head;
            while ($current->next !== null) {
                $current = $current->next;
            }
            $current->next = $newNode;
        }
    }
}

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

public function delete($data) {
    if ($this->head === null) {
        return;
    }

    if ($this->head->data === $data) {
        $this->head = $this->head->next;
        return;
    }

    $current = $this->head;
    while ($current->next !== null && $current->next->data !== $data) {
        $current = $current->next;
    }

    if ($current->next !== null) {
        $current->next = $current->next->next;
    }
}

$linkedList = new LinkedList();
$linkedList->append(10);
$linkedList->append(20);
$linkedList->append(30);

echo "Initial List:\n";
$linkedList->display();

$linkedList->delete(20);
echo "After Deleting 20:\n";
$linkedList->display();

Initial List:
10 -> 20 -> 30 -> NULL
After Deleting 20:
10 -> 30 -> NULL