class Ball{
const SHAPE = "circular";
public $area = null;
}
class Football extends Ball{
const PI = 3.14;
public $radius;
public function __construct($radius){
$this->radius = $radius;
}
public function doIt(){
$this->area = PI*pow($this->radius,2);
return "the shape of the ball is:".self::SHAPE."the area is:".$this->area;
}
}
$fb = new Football(2.15);
echo $fb.doIt();
詳細(xì)代碼如上，代碼編寫(xiě)沒(méi)有問(wèn)題，但是就是執(zhí)行不了，提示Call to undefined function doIt()，不知道怎么回事。
Call to undefined function doIt()
開(kāi)心每一天1111
2019-03-18 15:24:15
