给php代码中添加增删改功能的代码

当然，我可以帮你添加增删改功能的 PHP 代码。以下是一个简单的示例：

<?php
// 连接数据库
$host = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_dbname";

$conn = new mysqli($host, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 添加数据
if(isset($_POST['add'])){
    $name = $_POST['name'];
    $email = $_POST['email'];
    
    $sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
    
    if ($conn->query($sql) === TRUE) {
        echo "数据添加成功！";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

// 删除数据
if(isset($_GET['delete'])){
    $id = $_GET['delete'];
    
    $sql = "DELETE FROM users WHERE id = $id";
    
    if ($conn->query($sql) === TRUE) {
        echo "数据删除成功！";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

// 更新数据
if(isset($_POST['update'])){
    $id = $_POST['id'];
    $name = $_POST['name'];
    $email = $_POST['email'];
    
    $sql = "UPDATE users SET name='$name', email='$email' WHERE id=$id";
    
    if ($conn->query($sql) === TRUE) {
        echo "数据更新成功！";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

// 获取所有数据
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - 姓名: " . $row["name"]. " - 邮箱: " . $row["email"]. "<br>";
        echo "<a href='?delete=".$row["id"]."'>删除</a>";
        echo " | ";
        echo "<a href='update.php?id=".$row["id"]."'>编辑</a>";
        echo "<br><br>";
    }
} else {
    echo "没有数据";
}

$conn->close();
?>

请注意，上述代码仅为示例，实际应用中需要根据你的具体需求进行调整。还需要创建一个数据库表格 `users`，包含 `id`、`name` 和 `email` 字段。同时，代码中的数据库连接信息需要替换成你自己的实际信息。