select.php

try {
    // $pdo は接続オブジェクト
    $pdo = new PDO("mysql:host=localhost; dbname=pdotest",
                   "root", "pass");
    $stmt = $pdo->query("SELECT * FROM CD");

    while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
        echo implode(", ", $row) . PHP_EOL;
    }
} catch (PDOException $e){
    var_dump($e->getMessage());
}

$pdo = null;