循环直到值为null

Question

如果数据库中有用户输入的id，我需要循环删除过程。有人可以帮我这个吗？

 //my php code 
 $ppnum=$_POST['pnum'];

while ($ppnum !== null)) {
$con=mysqli_connect("","","","");
                if (mysqli_connect_errno()){
                  echo "Failed to connect to MySQL: " . mysqli_connect_error();
                }

 mysqli_query($con,"DELETE FROM tbldd WHERE pnum ='$ppnum'");

mysqli_close($con);} 

Answer 1

也许你想要这个？假设$ _POST ['pnum']是逗号分隔的ID列表。

$ppnum=$_POST['pnum'];

$con=mysqli_connect("","","","");
if (mysqli_connect_errno()){
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

mysqli_query($con,"DELETE FROM tbldd WHERE pnum in ($ppnum)");

mysqli_close($con);

但你必须检查$ _POST ['pnum']对抗sql注入攻击。