Simple random item generator

SimpleRandom.php

<?php
/**
 * Created by PhpStorm.
 * User: hocvt
 * Date: 8/7/17
 * Time: 10:29
 */

namespace App\Colombo\Libs;


class SimpleRandom {
	
	private $items = [];
	private $total = 0;
	
	
	/**
	 * SimpleRandom constructor.
	 *
	 * @param array $items \
	 * @param int|string $mode 1|100|number
	 */
	public function __construct(array $items = [], $mode = 'number') {
		$function = 'importInMode' . ucfirst($mode);
		$this->{$function}($items);
		$this->shuffleItems();
	}
	
	private function importInMode1($input = []){
		$result = [];
		$total = 0;
		foreach ($input as $k => $v){
			if (is_array($v)){
				$result[$v['key']] = ceil(floatval($v['value']) * 100);
			}else{
				$result[$k] = ceil(floatval($v) * 100);
			}
			$total += $result[$k];
		}
		if($total != 100){
			throw new \Exception("Tong gia tri khac 100%");
		}
		$this->total = $total;
		$this->items = $result;
	}
	
	private function importInMode100($input = []){
		$result = [];
		$total = 0;
		foreach ($input as $k => $v){
			if (is_array($v)){
				$result[$v['key']] = $v['value'];
			}else{
				$result[$k] = $v;
			}
			$total += $result[$k];
		}
		if($total != 100){
			throw new \Exception("Tong gia tri khac 100");
		}
		$this->total = $total;
		$this->items = $result;
	}
	
	private function importInModeNumber($input = []){
		$result = [];
		$total = 0;
		foreach ($input as $k => $v){
			if (is_array($v)){
				$result[$v['key']] = isset($v['value']) ? intval($v['value']) : 1;
			}elseif(is_numeric($k)){
				$result[$v] = 1;
			}else{
				$result[$k] = $v;
			}
			$total += $result[$k];
		}
		$this->total = $total;
		$this->items = $result;
	}
	
	private function shuffleItems(){
			
	}
	
	private function getKey($randInt){
		if($randInt > $this->total){
			$randInt = $randInt % $this->total;
		}
		foreach ($this->items as $k => $v){
			if($randInt < $v){
				return $k;
			}else{
				$randInt -= $v;
			}
		}
	}
	
	private function randomOne(){
		$randomInt = rand(0, $this->total - 1);
		return $this->getKey($randomInt);
	}
	
	public function getRandom($number = null){
		if(!$number){
			return $this->randomOne();
		}else{
			$result = [];
			for ($i = 0; $i<$number; $i++){
				$result[] = $this->randomOne();
			}
			return $result;
		}
	}
	
}

TestSimpleRandom.php

<?php

namespace App\Console\Commands;

use App\Colombo\Libs\SimpleRandom;
use Illuminate\Console\Command;

class TestSimpleRandom extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'simplerandom';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Command description';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
	    $times = 1000000;
        $random_items = [
        	'downloadable' => 0.2,
	        'google' => 0.4,
	        'dropbox' => 0.4
        ];
        $generator = new SimpleRandom($random_items, 1);
	    $random_counter = [
		    'downloadable' => 0,
		    'google' => 0,
		    'dropbox' => 0
	    ];
	    $t_start = microtime(true);
        for ($i = 0; $i < $times; $i++){
        	$k = $generator->getRandom();
	        $random_counter[$k]++;
        }
        $t_end = microtime(true);
	    $this->info("Run " . $times . " times in " . round($t_end - $t_start, 2) . "second(s)");
        dd($random_counter);
    }
}