php - foreach循环重复值php sql

Question

为什么这个双 foreach 循环会重复值

 foreach($_POST['studentpoints'] as $value) {
        foreach($_POST['studentids'] as $valor) {
            $stmt->bindParam(':studentid', $studentids);
            $stmt->bindParam(':studentpoints', $points);
            $studentids = $valor; 
            $points = $value;
            $stmt->execute();
        }

这段代码不重复值，只读取学生的第一个id

foreach($_POST['studentpoints'] as $value) { 
        foreach($_POST['studentids'] as $valor) {
           $studentids = $valor;
        }

   $stmt->bindParam(':studentid', $studentids);
            $stmt->bindParam(':studentpoints', $points);
            $studentids = $valor; 
            $points = $value;
            $stmt->execute();

}

包含来自数据库的数据的表格

<?php foreach($rowstudents as $row): ?>
  <tr>
    <th><input type="hidden" name="studentids[]" value="<?php echo ' ' . htmlentities($row['studentid'], ENT_QUOTES, 'UTF-8') . ' ';?>" />
    <?php echo '' . htmlentities($row['studentid'], ENT_QUOTES, 'UTF-8') . '';?></th>  
    <th><?php echo '' . htmlentities($row['fname'], ENT_QUOTES, 'UTF-8') . '';?></th>
    <th><?php echo '' . htmlentities($row['lname'], ENT_QUOTES, 'UTF-8') . '';?></th> 
    <th><input type="text" name="studentpoints[]" value="<?php echo '' . htmlentities($row['studentpoints'], ENT_QUOTES, 'UTF-8') . '' ?>"></th>
  </tr>
<?php endforeach; ?>
</table>

Answer 1

您正在使用 for each 循环两次。除此之外似乎没有任何问题