<?php
/**
 * Orange Management
 *
 * PHP Version 7.0
 *
 * @category   TBD
 * @package    TBD
 * @author     OMS Development Team <dev@oms.com>
 * @author     Dennis Eichhorn <d.eichhorn@oms.com>
 * @copyright  2013 Dennis Eichhorn
 * @license    OMS License 1.0
 * @version    1.0.0
 * @link       http://orange-management.com
 */

namespace phpOMS\Utils\RnG;

/**
 * Array randomizer class
 *
 * @category   Framework
 * @package    phpOMS\Asset
 * @author     OMS Development Team <dev@oms.com>
 * @author     Dennis Eichhorn <d.eichhorn@oms.com>
 * @license    OMS License 1.0
 * @link       http://orange-management.com
 * @since      1.0.0
 */
class ArrayRandomize 
{
    /**
     * Yates array shuffler.
     *
     * @return string
     *
     * @since  1.0.0
     * @author Dennis Eichhorn <d.eichhorn@oms.com>
     */
    public static function yates(array $arr) : array
    {
        $shuffled = [];

        while($arr){
            $rnd = array_rand($arr);
            $shuffled[] = $arr[$rnd];
            array_splice($arr, $rnd, 1);
        }

        return $shuffled;
    }
    
    /**
     * Knuths array shuffler.
     *
     * @return string
     *
     * @since  1.0.0
     * @author Dennis Eichhorn <d.eichhorn@oms.com>
     */
    public static function knuth(array $arr) : array
    {
        $shuffled = [];

        for($i = count($arr)-1; $i > 0; $i--){
            $rnd = mt_rand(0, $i);
            $shuffled[$i] = $arr[$rnd];
            $shuffled[$rand] = $arr[$i];
        }

        return $shuffled;
    }
}