php语法如何直接通过MySQL查询数据

<?php
//数据库相关信息
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

//创建链接数据库
$conn = new mysqli($servername, $username, $password, $dbname);

//检查是否链接数据库成功
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

//查看指定表10条数据
$sql = "SELECT * FROM table_name LIMIT 10";

//查询执行
$result = $conn->query($sql);

//有数据输出
if ($result->num_rows > 0) {
  //每行输出数据
  while($row = $result->fetch_assoc()) {
    echo "序号: " . $row["id"]. " - 姓名: " . $row["name"]. " " . $row["surname"]. "<br>";
  }
} else {
    echo "0 results";
}
//关闭链接
$conn->close();
?>