PHP学习（10）面向对象开发学习（三）

<?php
//继承
class Root{
function dayin(){
  return "Root print <BR>";
}
}

class Son extends Root{

function dayin2(){

  return $this->dayin()."Son print <br>";

}

}

$p=new Son();

echo $p->dayin();

echo $p->dayin2();


?>



<?php
//重名继承
class Root{
function dayin(){
  return "Root print <BR>";
}
}

class Son extends Root{

function dayin(){

  return Root::dayin()."Son print <br>";

}

}

$p=new Son();

echo $p->dayin();

?>