MYSQLi数据访问批量删除

<link href="../bootstrap.min.css" rel="stylesheet" type="text/css" />
<script src="../bootstrap.min.js"></script>
<script src="../jquery-1.11.2.min.js"></script>

<body>
<form action="./pldelete.php" method="post">
<table class="table table-striped">
  <caption>人员信息展示</caption>
  <thead>
    <tr>
      <th><input type="checkbox" id="ckall"/>代号</th>
      <th>姓名</th>
      <th>性别</th>
      <th>民族</th>
      <th>生日</th>
      <th>操作</th>
    </tr>
  </thead>
  <tbody>
  	<?php
	$db = new MySQLi("localhost","root","123456","crud");
	$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></td>
    </tr>";
		}
	}
	?>
  </tbody>
</table>

<div><input type="submit" value="批量删除" /></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>
</body>

删除页面

<?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","123456","crud");
$result = $db->query($sql);
if($result){
	header("location:main.php");
}else{
	echo "删除失败！";
}