<?php
    $db = new MySQLi("localhost","root","123","ceshi");
    $sql = "select info.code,info.name,sex,nation.name,birthday from info,nation where info.nation=nation.code";
    $result = $db->query($sql);
    if($result){
        $arr = $result->fetch_all();
        foreach($arr as $v){
            $sex = $v[2]?"男":"女";
            echo "<tr>
      <td><input class='ck' type='checkbox' name='ck[]' value='{$v[0]}' />{$v[0]}</td>
      <td>{$v[1]}</td>
      <td>{$sex}</td>
      <td>{$v[3]}</td>
      <td>{$v[4]}</td>
      <td>
              <a href='./delete.php?code={$v[0]}' onclick=\"return confirm('确认删除么？')\">
              <button type='button' class='btn btn-primary btn-sm'>删除</button></a><a href='./xiugai.php?code={$v[0]}' >
            <button type='button' class='btn btn-primary btn-sm'>修改</button></a>
      </td>
    </tr>";
        }
    }
    ?>
  </tbody>
</table>

<div><input type="submit" value="批量删除" /><a href="./tianjia.php">添加数据</a></div>
</form>
<script type="text/javascript">
var ckall = document.getElementById("ckall");
ckall.onclick = function(){
    var xz = ckall.checked;
    var ck = document.getElementsByClassName("ck");
    for(var i=0;i<ck.length;i++){
        ck[i].checked = xz; 
    }
}
</script>

<?php
$arr = $_POST["ck"];

//delete from info where code in('p001','p002','p003')

$str = implode("','",$arr);
$sql = "delete from info where code in('{$str}')";

$db = new MySQLi("localhost","root","123","mydb");
$result = $db->query($sql);
if($result){
    header("location:main.php");
}else{
    echo "删除失败！";
}