上午创建一个结果编译器和我想要计算一个学生的总和,平均值和年级,但每当我尝试计算总和结束给我零请帮助我..下面是我使用的代码:如何使用php中的while循环计算总和和平均值
<?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 + $exam;
}
}
?>
<input type="submit" value="Compile" name="compile"/>
</table>
</form>
<?php
} else {
echo "Student Does Not Exists";
}
} else {
echo "You don't have Permission to access this page";
}
?>
输入正确的代码什么是所有行中的$ rows ['name'] –
您真的想在哪里计算?和漂亮的SQL注入。 –
每次有人使用不推荐的'mysql_ *'函数,一个可爱的小猫咪死在世界某个地方。 – roberto06