一个页面实现增删改查

通过一个页面实现增删改查的功能：
<?php
// 类型
class xm
{
    private $ser;
    private $unam;
    private $pad;
    private $dbname;
    private $conn;
    function __construct($ser = 'localhost', $unam = 'root', $pad = 'root', $dbname = 'aproj')
    {
        $this->ser = $ser;
        $this->unam = $unam;
        $this->pad = $pad;
        $this->dbname = $dbname;
        // 连接数据库
        $conn = new mysqli($ser, $unam, $pad, $dbname);
        if ($conn->connect_error) {
            die($conn->error);
        } else {
            $this->conn = $conn;
        }
    }
    function index()
    {
        // 查询
        $conn = $this->conn;
        $sql = "select * from proj order by ctime desc";
        $res = $conn->query($sql);
        if (!$res) {
            return $conn->error;
        } else {
            return $res->fetch_all(MYSQLI_ASSOC);
        }
    }
    function query($name, $url, $ctime, $isadd = 0)
    {
        // 增 删除 修改
        $conn = $this->conn;
        if ($isadd == 0) {
            $sql = "insert into proj (name,url,ctime) values('$name','$url','$ctime')";
        } else {
            $sql = "update proj set name='$name', url='$url' where id = '$isadd' ";
        }

        $res = $conn->query($sql);
        if ($res) {
            return $res;
        } else {
            return $conn->error;
        }
    }
    function del($id)
    {
        // 增 删除 修改
        $conn = $this->conn;
        $sql = "delete from proj where id = '$id'";
        $res = $conn->query($sql);
        if ($res) {
            return $res;
        } else {
            return $conn->error;
        }
    }
    function __destruct()
    {
        $conn = $this->conn;
        $conn->close();
    }
}
$xm = new xm();
$ction = 'index';
if (isset($_GET['c'])) {
    $ction = $_GET['c'];
}
switch ($ction) {
    case 'query':
        if ($_POST) {
            $id = $_POST['id'];
            $name = trim($_POST['name']);
            $url = trim($_POST['url']);
            $ctime = time();
            if ($id == 0) {
                $xm->query($name, $url, $ctime);
            } else {
                $xm->query($name, $url, $ctime, $id);
            }
            // header('location:index.php');
        }
        break;
    case 'del':
        if (isset($_GET['id'])) {
            $id = $_GET['id'];
            $xm->del($id);
            // header('location:index.php');
        }
        break;
}
// 查询所有数据
$arr = $xm->index();

?>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>所有项目说明</title>
    <link rel="stylesheet" href="js/css/layui.css" media="all">
</head>

<body>
    <div style="width:800px; float:left; padding-left: 50px;">
        <table class="layui-table" lay-filter="test" id="demo">
            <colgroup>
                <col width="10">
                <col width="200">
                <col width="150">
                <col width="200">
                <col width="200">
                <col>
            </colgroup>
            <thead>
                <tr>
                    <th>ID</th>
                    <th>项目名</th>
                    <th>位置</th>
                    <th>创建时间</th>
                    <th>操作</th>
                </tr>
            </thead>
            <tbody>
                <?php
                foreach ($arr as $val) {
                ?>
                    <tr>
                        <td><?php echo $val['id']; ?></td>
                        <td><?php echo $val['name']; ?></td>
                        <td><?php echo $val['url']; ?></td>
                        <td><?php echo date('Y-m-d', $val['ctime']); ?></td>
                        <td>
                            <a class="layui-btn layui-btn-xs edit" id="<?php echo $val['id'] ?>">编辑</a>
                            <a class="layui-btn layui-btn-danger layui-btn-xs" href="index.php?c=del&id=<?php echo $val['id'] ?>">删除</a>
                        </td>
                    </tr>
                <?php
                }
                ?>
            </tbody>
        </table>
    </div>
    <div style="width: 300px; float:left; padding-top: 50px;">
        <form class="layui-form" action="index.php?c=query" method="post">
            <div class="layui-form-item">
                <label class="layui-form-label">项目名：</label>
                <div class="layui-input-block">
                    <input type="text" name="name" required lay-verify="required" placeholder="请输入标题" autocomplete="off" class="layui-input">
                </div>
            </div>
            <div class="layui-form-item">
                <label class="layui-form-label">文件位置：</label>
                <div class="layui-input-block">
                    <input type="text" name="url" required lay-verify="required" placeholder="请输入标题" autocomplete="off" class="layui-input">
                </div>
            </div>
            <div class="layui-form-item">
                <label class="layui-form-label">文件位置：</label>
                <div class="layui-input-block">
                    <input type="text" name="id" id="ids" value='0' required lay-verify="required" placeholder="请输入标题" autocomplete="off" class="layui-input">
                </div>
            </div>
            
            <div class="layui-form-item">
                <div class="layui-input-block">
                    <button class="layui-btn" lay-submit lay-filter="formDemo">立即提交</button>
                    <button type="reset" class="layui-btn layui-btn-primary">重置</button>
                </div>
            </div>
        </form>
    </div>
</body>
<script src="js/layui.all.js"></script>
<script src="js/jquery.min.js"></script>
<script>
    $('.edit').click(function(){
        var id = $(this).attr('id');
        $('#ids').val(id);
    });
</script>

</html>
一个页面实现增删改查

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