php 试题总结（附参考答案）(8)

    return $this->a;

  }

  function getB(){

    return $this->b;

  }

  function xprint(){

    echo "a=".$this->a." b=".$this->b;

  }

};

class test1 extends test{

  var $c,$d;

  function test1($a,$b,$c,$d){

    $this->a=$a;

    $this->b=$b;

    $this->c=$c;

    $this->d=$d;

  }

function getC(){

    return $this->c;

  }

  function getD(){

    return $this->d;

  }

function xprint(){

    echo "a=".$this->a." b=".$this->b." c=".$this->c." d=".$this->d;

  }

};

$x=new test(0,0);

$x->xprint();

echo "<br>\n";

$y=new test1(1,2,3,4);

$y->xprint();

?>

a=0 b=0

a=1 b=2 c=3 d=4