Transforming an array into a traversable object with PHP

Published on 2024-04-21 • Modified on 2024-04-21

This snippet shows how to transform an array into a traversable object with PHP. A reminder: iterable is a type hint introduced in PHP 7.1, whereas Traversable is a PHP interface. In this case, ArrayIterator implements the Traversable interface dans and be type hinted with iterable.



namespace App\Controller\Snippet;

 * I am using a PHP trait to isolate each snippet in a file.
 * This code should be called from a Symfony controller extending AbstractController (as of Symfony 4.2)
 * or Symfony\Bundle\FrameworkBundle\Controller\Controller (Symfony <= 4.1).
 * Services are injected in the main controller constructor.
trait Snippet299Trait
    public function snippet299(): void
        $ai = new \ArrayIterator([
            'foo' => 'bar',
            'dd' => 'DD',

        var_dump($ai->getArrayCopy(), $ai->count(), is_iterable($ai), is_a($ai, \Traversable::class)); // @phpstan-ignore-line

        // That's it! 😁

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