php操作mysql数据库基本步骤

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

$sql = "SELECT * FROM table_name";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        echo "字段1：" . $row["column1"]. " - 字段2：" . $row["column2"]. "<br>";
    }
} else {
    echo "0 结果";
}

mysqli_close($conn);