有人能解释我的代码出了什么问题吗？

Question

这是我的代码

<div class="table-responsive">
                        <table class="table table-striped table-hover">
                            <thead>
                                <tr>
                                    <td>Id</td>
                                    <td>Articles Category</td>
                                    <td>Update</td>
                                    <td>Delete</td>
                                </tr>
                            </thead>
                            <tbody>
                                <tr>
                                    <?php
                                        $con = new mysqli("localhost", "root", "", "whatever");

        $sql = "SELECT id_kategori, nama_kategori FROM kategori";
        $stmt = $con->prepare($sql);
        $stmt->execute();
        $stmt->bind_result($id, $cat);
        while($stmt->fetch())
        {
            echo "<td>$id</td>";
            echo "<td>$cat</td>";
            echo "<td>Update</td>";
            echo "<td>Delete</td>";
        }
        $stmt->close();
                                    ?>
                                </tr>
                            </tbody>
                        </table>
                    </div>

结果告诉我这个

  

“prepare（$ sql）; $ stmt-＆gt; execute（）; $ stmt-＆gt; bind_result（$ id，$ cat）; while（$ stmt-＆gt; fetch（））{echo”“; echo “”; echo“”; echo“”;} $ stmt-＆gt; close（）;？＆gt;“

我将它改为像这样的面向对象

<div class="table-responsive">
                        <table class="table table-striped table-hover">
                            <thead>
                                <tr>
                                    <td>Id</td>
                                    <td>Articles Category</td>
                                    <td>Update</td>
                                    <td>Delete</td>
                                </tr>
                            </thead>
                            <tbody>
                                <tr>
                                    <?php 
                                        include 'connection.php'; 
                                        $showall = new connection(); 
                                        $showall->category(); 
                                    ?>
                                </tr>
                            </tbody>
                        </table>
                    </div>

我的结果就是这个

  

类别（）; ？＆GT;

有人可以解释我的代码出了什么问题吗？

Answer 1

首先，您使用了非常糟糕的编码标准。您只是在HTML中间编写数据库连接？好的，您可以将HTML写为

#define BOOST_SPIRIT_DEBUG