在PHP中从类别匹配表填充复选框

<?php
// 连接数据库
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名称";

$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
}

// 查询类别数据
$sql = "SELECT id, name FROM categories";
$result = $conn->query($sql);

// 构建复选框
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $categoryId = $row["id"];
        $categoryName = $row["name"];

        // 检查是否选中
        $checked = in_array($categoryId, $selectedCategories) ? "checked" : "";

        // 创建复选框
        echo "<input type='checkbox' name='categories[]' value='$categoryId' $checked> $categoryName<br>";
    }
} else {
    echo "没有找到任何类别.";
}

// 关闭数据库连接
$conn->close();
?>