php怎么写入mysql数据库代码

$conn = mysqli_connect("localhost", "username", "password", "database_name");
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

$sql = "INSERT INTO users (username, email) VALUES ('John', 'john@example.com')";

if (mysqli_query($conn, $sql)) {
    echo "数据插入成功！";
} else {
    echo "错误: " . mysqli_error($conn);
}

$conn = mysqli_connect("localhost", "username", "password", "database_name");
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

$sql = "INSERT INTO users (username, email) VALUES ('John', 'john@example.com')";

if (mysqli_query($conn, $sql)) {
    echo "数据插入成功！";
} else {
    echo "错误: " . mysqli_error($conn);
}

mysqli_close($conn);