class BubleSort
{
	private $array;

	function __construct($array2)
	{
		$this->array = $array2;
		echo '<br />';
	}

	public function posortuj()
	{
	 	$a=true;
	 	$tmp;
	 	$j=0;
	 	while ($a)
	 	{
	 		$a= false;
	 		$j++;
	 		for ($i=0; $i < count($this->array) - $j; $i++)
	 		{
	 			if ($this->array[$i] > $this->array[$i + 1])
	 			{
	 				$tmp = $this->array[$i];
	 				$this->array[$i] = $this->array[$i + 1];
	 				$this->array[$i + 1] = $tmp;
	 				echo '<br  />';
	 				$a= true;
	 			}
	 		}
	 	}
	 	return $this->array;
	}
}

$tablica = array(21,2,6,5,3,6,7);
$sortowanie = new BubleSort($tablica);
print_r( $sortowanie->posortuj());