PHP:无法删除多个选定数据

目前，我创建了一个系统，允许用户使用复选框删除多个数据

步骤如下：

1） 用户在dashboard.php上选择团队，时间在dashboard.php之前，时间在dashboard.php之后。用户单击“搜索”按钮以显示结果。显示结果使用AJAX。AJAX将重定向到range.php

2） 用户可以选择显示和删除的任何数据行

我的问题是，删除功能失败，虽然我做了正确的步骤和代码。以下是当前代码：

range.php

    <?php

    require_once "../../../config/configPDO.php";
    require_once "../../../config/check.php";

    $email = $_SESSION['login_user'];


    if(isset($_POST["From"], $_POST["to"], $_POST["team"]))
    {

    $result = '';
    $query = "SELECT * FROM ot_report LEFT JOIN ot_users ON ot_report.badgeid = ot_users.badgeid WHERE ot_users.team_id = '".$_POST['team']."' AND report_date BETWEEN '".$_POST["From"]."' AND '".$_POST["to"]."' ORDER BY ot_report.report_date DESC";
    $sql = $conn->prepare($query, array(PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL));
    $sql -> execute();

    if(isset($_POST['save'])){
        $checkbox = $_POST['check'];
        for($i=0;$i<count($checkbox);$i++){
            $del_id = $checkbox[$i];

            $sql2 = "DELETE FROM ot_report WHERE report_id=:report_id";
            $query2 = $conn->prepare($sql2);
            $query2->execute(array(':report_id' => $del_id));

            header("Location: dashboard.php");
        }
    }


    if($sql->rowCount() > 0)
    {
        echo'

        <form method="post" action="">
        <div><a href="../pdf.php?from='.$_POST["From"].'&to='.$_POST["to"].' &team='.$_POST["team"].'" target="_blank"><u>PDF View</u></a></div><br>
        <div class="row" style="height: 300px; overflow-y: scroll;">
        <div class="col-lg-12 grid-margin stretch-card">
        <table class = "table-bordered" width = "100%">
        <thead>
        <tr>
        <th width = "10%"><input type="checkbox" id="checkAl"> All</th>
        <th width = "3%">id</th>
        <th width = "15%">Date</th>
        <th width = "25%">Supervisor</th>
        <th width = "30%">Task Name</th>
        <th width = "10%">Status</th>
        <th width = "7%">Action</th>
        </tr>
        </thead>
        <tbody>';
        $i=0;
        while($row = $sql->fetch(PDO::FETCH_ASSOC))
        {
            $datereport = $row['report_date'];
            $datereport2 = strtotime($datereport);
            $report_date = date('d M Y', $datereport2);

            $status=$row['report_status'];
            if($status=="Pending")
            {
                $color="color:blue";
            }
            else 
            {
                $color="color:green";
            }

            if ($row['ot_start'] == '00:00:00'){
                $ot_start = '-';
            }else{}

            if ($row['ot_end'] == '00:00:00'){
                $ot_end = '-';
            }else{}


            echo'<tr>';
                echo '<td><input type="checkbox" id="checkItem" name="check[]" value='.$row['report_id'].'></td>';
                echo '<td>'.$row["report_id"].'</td>';
                echo '<td>'.$report_date.'</td>';
                echo '<td>'.$row["fullname"].'</td>';
                echo '<td>'.$row["task_name"].'</td>';
                echo '<td align="center" style='.$color.'><strong>'.$status.'</strong></td>';
                echo '<td align="center">';
                echo '<a class="btn-view btn-primary btn-sm" href="view_task/view_task.php?report_id='. $row["report_id"] .'" data-toggle="tooltip">View</a>';
                echo '<a class="btn-view btn-danger btn-sm" href="delete.php?report_id='. $row["report_id"] .'" onClick=\'return confirm("Do you want to remove team?")\'>Delete</a></td>';
                echo '</td>';

            echo '</tr>';
            $i++;

        }
            echo '<tr>';
                echo '<td><p align="center"><button type="submit" class="btn-danger btn-sm" name="save">DELETE</button></p></td>';
            echo '</tr>';
            echo '</form>';

    }
    else
    {
        echo '
        <table class = "table-bordered" width = "100%">
        <thead>
        <tr>
        <th width = "5%">id</th>
        <th width = "12%">Date</th>
        <th width = "29%">Supervisor</th>
        <th width = "23%">Task Name</th>
        <th width = "7%">From</th>
        <th width = "7%">To</th>
        <th width = "10%">Status</th>
        <th width = "7%">Action</th>
        </tr>
        <tr>
        <td colspan="8">No report found</td>
        </tr>';
    }
    echo '</body></table></div></div>';

    }

    ?>

    <script>
    $("#checkAl").click(function () {
    $('input:checkbox').not(this).prop('checked', this.checked);
    });
    </script>

尝试将此更改为：

$query = "DELETE FROM ot_report WHERE report_id LIKE ?";            
$sql2 = $conn->prepare($query);
$sql2->bind_param("i", $del_id);
$sql2->execute();

首先，我要修复您在那里创建的非常无效的HTML，因为到处都有嵌套错误。OP使用的是PDO而不是mysqli
$query = "DELETE FROM ot_report WHERE report_id LIKE ?";            
$sql2 = $conn->prepare($query);
$sql2->bind_param("i", $del_id);
$sql2->execute();