CQRS pattern with Specification pattern in PHP

cqrs-specification.php

<?php

interface Command
{
    public function execute();
}

class TaskList
{
    private $tasks = [];

    public function add(Task $task)
    {
        $this->tasks[] = $task;
    }

    public function getTasks()
    {
        return $this->tasks;
    }
}

interface Query
{
    public function execute();
}

class CreateTaskCommand implements Command
{
    private $taskName;
    private $taskList;

    public function __construct(Task $task, TaskList $taskList)
    {
        $this->taskName = $task;
        $this->taskList = $taskList;
    }

    public function execute()
    {
       $this->taskList->add($this->taskName);
    }
}

class GetTasksQuery implements Query
{
    private $specification;
    private $taskList;

    public function __construct(TaskSpecification $specification, TaskList $taskList)
    {
        $this->specification = $specification;
        $this->taskList = $taskList;
    }

    public function execute()
    {
        // Get all tasks from the database that meet the specified criteria
        $tasks = $this->taskList->getTasks();
        $true = [];
        foreach($tasks as $task){
            if($this->specification->isSatisfiedBy($task)){
                $true[] = $task;
            }
        }
        // ...

        return $true;
    }
}

interface TaskSpecification
{
    public function isSatisfiedBy(Task $task): bool;
}

class CompletedTaskSpecification implements TaskSpecification
{
    public function isSatisfiedBy(Task $task): bool
    {
        return $task->isCompleted();
    }
}

class Task
{
    public $name;
    public $isCompleted;

    public function __construct(string $name, bool $isCompleted)
    {
        $this->name = $name;
        $this->isCompleted = $isCompleted;
    }

    public function isCompleted(): bool
    {
        return $this->isCompleted;
    }
}

class CommandBus
{
    public function handle(Command $command)
    {
        $command->execute();
    }
}

class QueryBus
{
    public function handle(Query $query)
    {
        return $query->execute();
    }
}

$commandBus = new CommandBus();
$queryBus = new QueryBus();
$taskList = new TaskList();


$task1= new Task('task 1', false);
$task2= new Task('task 2', true);

$command = new CreateTaskCommand($task1, $taskList);
$commandBus->handle($command);

$command = new CreateTaskCommand($task2, $taskList);
$commandBus->handle($command);

// Get all completed tasks
$specification = new CompletedTaskSpecification();
$query = new GetTasksQuery($specification, $taskList);
$tasks = $queryBus->handle($query);
var_dump($tasks);