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<?php
declare(strict_types=1);
namespace AlecRabbit\Spinner\Core;
class Circular
{
/** @var mixed */
protected $data;
/** @var bool */
protected $oneElement = false;
/** @var int */
protected $idx = -1; // To pass tests written before
protected $length = 0;
/**
* Circular constructor.
* @param array $data
*/
public function __construct(array $data)
$this->data = $this->refineData($data);
}
* @return mixed
protected function refineData(array $data)
$this->length = count($data);
if (1 === $this->length) {
$this->oneElement = true;
return reset($data);
if (0 === $this->length) {
return null;
return $data;
public function __invoke()
return $this->value();
public function value()
if ($this->oneElement) {
return $this->data;
if (++$this->idx === $this->length) {
$this->idx = 0;
return $this->data[$this->idx];
alecrabbit /
php-console-spinner
