A simple quick sort

<?php/** * created by phpstorm. * user: saint * date: 15/ 8/5 * time:  Morning 11:49 */class demo{    public  $a  =  Array (3, 6, 9, 2, 4, 7, 1, 5, 8, 0);     Public function qsort ($left,  $right)     {         if ($left  >  $right)  {             return;        }          $i  =  $left;         $j  =  $right;          $standard  =  $this->a[$left];         while ($i  !=  $j)  {             //  Find cells             while from right to left that are smaller than the base number ($standard   <=  $this->a[$j])  &&  ($j  >  $i))  {                  $j--;             }            / /  from left to right to find             while (($standard  >=  $this->a[$i])  &&  ($j  >  $i))  {                  $i ++;             }              $tmp  =  $this->a[$i];              $this->a[$i] =  $this->a[$j];             $this->a[$j]  =  $tmp;        }         //  determine the position of the base number          $this->a[$left] =  $this- >a[$i];         $this->a[$i] =  $standard;          $this->qsort ($left,  $i  - 1);          $this->qsort ($i  + 1,  $right);    }     //  execution Function     public function main ()     {          $left  = 0;          $right  = count ($this->a)  - 1;        $ This->qsort ($left,  $right);         print_r ($this->a);     }} $demo  = new demo (); $demo->main ();

A simple quick sort