如何在MySqli中正确使用带OR条件的PHP？

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

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

$sql = "SELECT * FROM table_name WHERE column1 = 'value1' OR column2 = 'value2'";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        // 处理每一行的数据
        echo "列1: " . $row["column1"]. " - 列2: " . $row["column2"]. "<br>";
    }
} else {
    echo "0 结果";
}

$conn->close();