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<?php namespace Illuminate\Database\Eloquent\Factories; class Sequence { /** * The sequence of return values. * * @var array */ protected $sequence; /** * The count of the sequence items. * * @var int */ protected $count; /** * The current index of the sequence. * * @var int */ protected $index = 0; /** * Create a new sequence instance. * * @param array $sequence * @return void */ public function __construct(...$sequence) { $this->sequence = $sequence; $this->count = count($sequence); } /** * Get the next value in the sequence. * * @return mixed */ public function __invoke() { if ($this->index > ($this->count - 1)) { $this->index = 0; } return tap($this->sequence[$this->index], function () { $this->index = $this->index + 1; }); } }