So berechnen Sie Summe und Durchschnitt mit While-Schleife in PHP

Question

Am Erstellen eines Ergebnis Compiler und ich möchte die Summe, Durchschnitt und Note eines Schülers berechnen, aber jedes Mal, wenn ich versuche, die Summe zu berechnen endet es mir bitte helfen Sie mir .. unten ist der Code, den ich verwenden:

<?php 
require 'php/functions.php'; 

if (isset($_GET['student'])) { 
    $student = $_GET['student']; 
    $part  = explode(' ', $student); 
    $lastname = $part[0]; 
    $firstname = $part[1]; 




    //selecting values from database; 
    $query  = "SELECT * FROM `students` WHERE `lastname` = '$lastname' AND `firstname` = '$firstname'"; 
    $result  = mysql_query($query); 
    $numrows = mysql_num_rows($result); 

    $class  = mysql_result($result, 0, 'class'); 
    $house  = mysql_result($result, 0, 'house'); 
    $gender  = mysql_result($result, 0, 'gender'); 
    $ad_no  = mysql_result($result, 0, 'admission_no'); 



    if ($numrows == 1) { 
     ?> 
     <p>Lastname: <?php echo trim($lastname); ?></p> 
     <p>Firstname: <?php echo trim($firstname); ?></p> 
     <p>Class: <?php echo trim($class); ?></p> 
     <p>House: <?php echo trim($house); ?></p> 
     <p>Gender: <?php echo trim($gender); ?></p> 
     <p>Admission Number: <?php echo trim($ad_no); ?></p> 

     <table border="1" cellspacing="2" cellpadding="9"> 
    <tr> 
     <td>Subjects</td> 
     <td>C.A</td> 
     <td>M.T.E</td> 
     <td>Exam</td> 
     <td>Total</td> 
     <td>Grade</td> 
     <td>Remark</td> 

    </tr> 

    <tr> 
    <form method="POST" action=""> 
    <?php 
    $query  = "SELECT `name` FROM `senior_subject`"; 
    $result = mysql_query($query); 


     while ($rows = mysql_fetch_assoc($result)) { 
     echo "<td>".$rows['name']."<br/></td>"; 

     ?> 

    <td><input type="text" 
    name = "<?php echo $rows['name'].'_ca'; ?>" 
    placeholder = "<?php echo $rows['name']; ?> CA"/></td> 
    <td><input type="text" 
    name = "<?php echo $rows['name'].'_mte'; ?>" 
    placeholder = "<?php echo $rows['name']; ?> MTE"/></td> 
    <td><input type="text" 
    name = "<?php echo $rows['name'].'_exam'; ?>" 
    placeholder = "<?php echo $rows['name']; ?> EXAM"/></td> 
    <td><input type="text" disabled='disabled' name = "<?php echo $rows['name'].'_total'; ?>"/></td> 
    <td><input type="text" disabled='disabled' name = "<?php echo $rows['name'].'_grade'; ?>"/></td> 
    <td><input type="text" disabled='disabled' name = "<?php echo $rows['name'].'_remark'; ?>"/></td> 



    </tr> 
     <?php 
     if(isset($_POST['compile'])) { 
      $ca = $rows['name'].'_ca'; 
      $mte = $rows['name'].'_mte'; 
      $exam = $rows['name'].'_exam'; 
      $total = $rows['name'].'_total'; 
      $grade = $rows['name'].'_grade'; 
      $total = $rows['name'].'_remark'; 

      echo $ca + $mte + $exam; 

     } 
    } 
    ?> 
<input type="submit" value="Compile" name="compile"/> 

</table> 
</form> 

     <?php 

    } else { 
     echo "Student Does Not Exists"; 
    } 
} else { 
    echo "You don't have Permission to access this page"; 
} 
?> 

Answer 1

Try this

if(isset($_POST['compile'])) { 
     $ca = $rows['name'].'_ca'; 
     $mte = $rows['name'].'_mte'; 
     $exam = $rows['name'].'_exam'; 
     $total = $rows['name'].'_total'; 
     $grade = $rows['name'].'_grade'; 
     $total = $rows['name'].'_remark'; 
     $total += $total; 
} 

Und außerhalb der while-Schleife in Start-plus $ gesamt = 0;

In endendem Echo $ total;