検証要求sql

Question

私のSQLリクエストの検証が機能しない理由を説明できますか？ それは常に* **

<?php 
include 'conn_mysql.php'; 
if (isset($_POST['Login_fieldR']) && isset($_POST['Password_fieldR'])){ 
    $login_fieldR = $_POST['Login_fieldR']; 
    $password_fieldR = $_POST['Password_fieldR']; 
    $dateregister=NULL; 
    try{  
     $bdd = new PDO($conStr,$user,$pass); 
    } catch (PDOException $e){ 
     die('could not connect to the database'.$e->getMessage()); 
    } 
    $req = $bdd->prepare('INSERT INTO users(login, password, dateregister) VALUES(?, ?, NOW())'); 
    $req->execute(array($login_fieldR,$password_fieldR)); 

    $result = $req->fetch(); 
    if (!$result) 
    { 
     echo '<p id="popup_text">Problem..</p>'; 
    } 
    else 
    { 
     echo '<p id="popup_text">You are registered ! You can logged in now'; 
    } 
} 
?> 

Answer 1

が成功/失敗メッセージ

$res = $req->execute(array($login_fieldR,$password_fieldR)); 
    if (!$res) 
    { 
     echo '<p id="popup_text">Problem..</p>'; 
    } 
    else 
    { 
     echo '<p id="popup_text">You are registered ! You can logged in now'; 
    }