谁能帮我详细解答下这段代码啊  新手问题

<?php
class MyArray{
  protected $Total;
  protected $Start;
  protected $Step;
  protected $Ratio;
  function __construct($Total=10,$Start=3,$Step=3,$Ratio=10){
    $this->Total=$Total;
    $this->Start=$Start;
    $this->Step=$Step;
    $this->Ratio=$Ratio;
  }
  function ReturnArray(){
    $array=array();
    for($i=$this->Start;$i<=$this->Total*$this->Step;$i=$i+$this->Step){
      $array[$i]=$i*$this->Ratio;
    }
    return $array;
  }
  function PrintArray(){
    print_r($this->ReturnArray());
  }
}
//实例化类
$newarr=new MyArray();
print_r($newarr->ReturnArray());
echo $newarr->PrintArray();
?>

你哪里看不懂呢？

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