Question

我是一个新手试图设计一个计算学生分数的应用程序。我正试图用OOP简化我的工作，我在这里一直有错误。这是我上课：

class fun {
var $totalscore;
public function score($assignment,$cat,$exam){

      return $totalscore = $assignment+$cat+$exam;

        if($totalscore <=100 && $totalscore >=70){
            return $grade = "A";
        }
        elseif($totalscore <=69 && $totalscore>=60){
            return $grade = "B";
        }
        elseif($totalscore <=59 && $totalscore>=50){
            return $grade = "C";
        }
        elseif($totalscore <=35 && $totalscore>=49){
            return $grade = "D";
        }
        elseif($totalscore <=40 && $totalscore>=34){
            return $grade = "E";
        }
        elseif($totalscore <=39 && $totalscore>=0){
        return $grade = "F";


 }
 }
 }

现在我试图调用变量我的意思是$ totalscore和$ grade在我的其他php下面

if(isset($_POST['update'])){
    $gnsa = $_POST['gnsa'];
    $gnst =$_POST['gnst'];
    $gnse =$_POST['gnse'];
    $agidi =$_POST['matric'];

   include ("class.php");
   $fun = new fun;
   $fun-> score($gnsa,$gnst,$gnse);
   if($totalscore > 100){
    echo "invalid score";
   }
   }

Answer 1

使用你的课时你正确地调用了这样的方法：

$fun->score($gnsa,$gnst,$gnse);

类的变量（通常称为成员或属性）只是被类似地调用（前提是它们是公共的）：

if($fun->totalscore > 100){
    echo "invalid score";
}

Answer 2

class fun
{
    // notice these 2 variables... they will be available to you after you
    // have created an instance of the class (with $fun = new fun())
    public $totalscore;
    public $grade;

    public function score($assignment, $cat, $exam)
    {
        $this->totalscore = $assignment + $cat + $exam;

        if ($this->totalscore >= 70) {
            $this->grade = "A";
        }
        else if ($this->totalscore <= 69 && $this->totalscore >= 60) {
            $this->grade = "B";
        }
        else if ($this->totalscore <= 59 && $this->totalscore >= 50) {
            $this->grade = "C";
        }

        else if ($this->totalscore <= 35 && $this->totalscore >= 49) {
            $this->grade = "D";
        }

        // there is probably something wrong here... this number (40) shouldn't
        // be higher than the last one (35)
        else if ($this->totalscore <= 40 && $this->totalscore >= 34) {
            $this->grade = "E";
        }
        else {
            $this->grade = "F";
        }
    }
}

现在，在您$fun->score($gnsa,$gnst,$gnse);之后，您将能够分别使用$fun->totalscore和$fun->grade访问总分和成绩。

如何在类中调用变量

2 个答案: