PHP arithmetic operation method

This article mainly introduces the method of calculating weighted average in PHP, involving related skills of PHP arithmetic operations, and has certain reference value. Friends in need can refer to it

The example of this article tells the calculation of weighted average in PHP average method. Share it with everyone for your reference. The details are as follows:

<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;
?>

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