PHP 计算加权(简单易用)

<?php
     
?>
<form action="index.php" method="post">
请输入你的课程的数量:<input type="text" name="course_number"/><br/>
<input type="submit" value="submit"/>
</form>

<?php session_start();
    $course_number=$_POST["course_number"];
    $_SESSION["course_number"]=$course_number;
    $m=0;
    echo "<form action=&#39;result.php&#39; method=&#39;post&#39;>";
    for($i=0;$i<$course_number;$i++):?>
    分数:<input type="text" name="<?php echo "course".$i;?>" />
    -------学分(权重):<input type="text" name="<?php echo "credit".$i;?>" /><br/><br/>
    <?php 
    endfor;
    echo "<input type=&#39;submit&#39; value=&#39;submit&#39;>";
    echo "</form>"."<br/>";
    ?>

<?php session_start();
    $score=array();
    $balance=array();
    $sum=0;
    $total_score=0;
    $result=0;
    for($i=0;$i<$_SESSION["course_number"];$i++)
    {
        $score[$i]=$_POST["course".$i];
    }
     
    for($i=0;$i<$_SESSION["course_number"];$i++)
    {
        $balance[$i]=$_POST["credit".$i];
    }
     
    for($i=0;$i<$_SESSION["course_number"];$i++)
    {
        $sum=$sum+$score[$i]*$balance[$i];
    }
     
    for($i=0;$i<$_SESSION["course_number"];$i++)
    {
        $total_score=$total_score+$balance[$i];
        echo $total_score."<br>";
    }
    $result=$sum/$total_score;
    echo "您的加权平均为:".$result;
?>