属性改变的Php run方法

Question

是否可以在属性更改上运行php方法？如下例所示:

类:

class MyClass
{
    public MyProperty;

    function __onchange($this -> MyProperty)
    {
        echo "MyProperty changed to " . $this -> MyProperty;
    }        
}

宾语:

$MyObject = new MyClass;
$MyObject -> MyProperty = 1;

结果:

 "MyProperty changed to 1"

Answer 1

就像@lucas所说的那样，如果可以在类中将属性设置为私有，则可以使用__set（）来检测更改。

class MyClass
{
  private $MyProperty;

  function __set($name, $value)
  {
     if(property_exists('MyClass', $name)){
       echo "Property". $name . " modified";
     }
  }

 }


$r = new MyClass;
$r->MyProperty = 1; //Property MyProperty changed.