Javascript 尝试删除php页面中的多条记录

我正在尝试下面的代码从数据库中删除多个记录。但当我打开users1.php时，我得到了以下结果

users1.php-下面的javascript代码是javscript代码

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
function deleteConfirm(){
    var result = confirm("Are you sure to delete users?");
    if(result){
        return true;
    }else{
        return false;
    }
}

$(document).ready(function(){
    $('#select_all').on('click',function(){
        if(this.checked){
            $('.checkbox').each(function(){
                this.checked = true;
            });
        }else{
             $('.checkbox').each(function(){
                this.checked = false;
            });
        }
    });

    $('.checkbox').on('click',function(){
        if($('.checkbox:checked').length == $('.checkbox').length){
            $('#select_all').prop('checked',true);
        }else{
            $('#select_all').prop('checked',false);
        }
    });
});
</script>

users1.php-php代码-下面是php代码

<?php
    include_once('dbcontroller.php');
    $query = mysqli_query($conn,"SELECT id, UserName, Type, department FROM Admin_Master";);
?>

<form name="bulk_action_form" action="users2.php" method="post" onsubmit="return deleteConfirm();"/>
    <table class="bordered">
        <thead>
        <tr>
            <th><input type="checkbox" name="select_all" id="select_all" value=""/></th>        
            <th>Username</th>
            <th>Type</th>
            <th>Department</th>

        </tr>
        </thead>
        <?php
            if(mysqli_num_rows($query) > 0){
                while($row = mysqli_fetch_assoc($query)){
        ?>
        <tr>
            <td align="center"><input type="checkbox" name="checked_id[]" class="checkbox" value="<?php echo $row['id']; ?>"/></td>        
            <td><?php echo $row['UserName']; ?></td>
            <td><?php echo $row['Type']; ?></td>
            <td><?php echo $row['department']; ?></td>

        </tr> 
        <?php } }else{ ?>
            <tr><td colspan="5">No records found.</td></tr> 
        <?php } ?>
    </table>
    <input type="submit" class="btn btn-danger" name="bulk_delete_submit" value="Delete"/>
</form>

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如果您需要更多信息，请告诉我

删除mysqli\u查询中的分号

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$query=mysqli\u query$conn，从Admin\u Master；中选择id、用户名、类型、部门

检查一下你在做什么：$query=mysqli\u query$conn，$yourquery；如果$结果{dieSQL错误：.mysqli_错误$conn；}@prakashtank抱歉，请检查答案…..有趣；我没有看到从…………中删除的内容，对此表示抱歉，是的，我在几秒钟前收到并发布了答案。。。。。