如何在以下PHP代码中使用计数器变量或任何其他替代方法设置每个单选按钮的名称?
<?php
$id=0; //counter variable
$sql ="select roll_number,student_name,gender from student_table";
$query=mysqli_query($dbcon, $sql) or die(mysqli_error($dbcon));
while($post=mysqli_fetch_assoc($query)){
echo '<tr>';
echo '<td>'. $post['roll_number'] . '</td>';
echo '<td>'. $post['student_name'] . '</td>';
echo '<td>'. $post['gender'] . '</td>';
echo '<td width=250>';
echo '<input type="radio" name="rad'.$id'" value="P" />Present';
echo '<input type="radio" name="rad'.$id'" value="A" />Absent';
echo '<button type="submit" name="save" value="Save" class="btn btn-success btn-sm">Save</button>';
++$id;
echo '</td>';
echo '</tr>';
}
?>
echo '<input type="radio" name="rad[' . $post['roll_number'] . ']" value="P" />Present';
echo '<input type="radio" name="rad[' . $post['roll_number'] . ']" value="A" />Absent';
在接收端，您可以这样做:
$answers = $_POST['rad'];
foreach($answers as $roll_number=>$answer){
//do something with the $roll_number and $answer...
}
更新代码，将$post改为$row，串接字符串，固定<button>等。任何地方都没有表单声明-如果你只有一个表单，这将保存/获取表单中的每个项目-根据你的需要，你可能想要为每个学生声明一个表单，具有唯一标识符。
<?php
$query = mysqli_query($dbcon, 'SELECT roll_number,student_name,gender FROM student_table') or die(mysqli_error($dbcon));
while ($row = mysqli_fetch_assoc($query)) {
echo '<tr>
<td>'.$row['roll_number'].'</td>
<td>'.$row['student_name'].'</td>
<td>'.$row['gender'].'</td>
<td width="250">
<label><input type="radio" name="rad['.$row['roll_number'].']" value="P">Present</label>
<label><input type="radio" name="rad['.$row['roll_number'].']" value="A">Absent</label>
<input type="submit" name="save" value="Save" class="btn btn-success btn-sm">
</td>
</tr>';
}
?>