MySQL DELETE语句不删除行

The code below is how I am removing data from my database. The user selects titles he wants to remove and then the query should delete those rows. Unfortunately, that isn't working.

I have made sure the DELETE query works by using it in PhpMyAdmin and MySQL Workbench, but for some reason the PHP code I'm coding is not allowing the deletes to work.

<?php
    session_start();
    require ("../login.php");

    if (!isset($_SESSION['user'])) 
        header('Location: ../index.php');

    include ("header.php");
    include ("subnav.php");
?>

    <h2>Current Subscriptions</h2>

    <?php

    $user_id = $_SESSION['user'];

    if (isset($_POST['submit'])) {
        foreach($_POST["titles"] as $title) {
            $stmt = $db->prepare("DELETE FROM subscriptions WHERE user=:user AND title=:title)");
            $stmt->bindValue(':user', $user_id, PDO::PARAM_INT);
            $stmt->bindValue(':title', $title, PDO::PARAM_INT);
            $stmt->execute();
        }
        echo '<p>Thank you! Your changes have been made!</p>';
    }
    else {
        $stmt = $db->prepare
            ("SELECT t.id, t.publisher, t.title
            FROM titles t
                JOIN subscriptions s
                    ON t.id = s.title
            WHERE s.user=:user
            ORDER BY t.id");

        $stmt->bindValue(':user', $user_id, PDO::PARAM_STR);
        $stmt->execute();
        $rows = $stmt->fetchAll();
        $num_rows = count($rows);
        if ($num_rows == 0)
            echo 'You are not currently subscribed to any titles.';
        else {
            ?>
            <form action="" method="post">
            <?php   
            foreach($rows as $row) 
                echo '<input type="checkbox" name="titles[]" value="' . $row['id'] . '">' . $row['publisher'] . ' - ' . $row['title'] . '<br>';
            ?>
            <input type="submit" value="Update" name ="submit" id="submit">
                </form>
        <?php
        }
    }
    ?>

<?php   
    include ("footer.php");
?>

I do see an extra ) in your SQL, try removing it.

 ("DELETE FROM subscriptions WHERE user=:user AND title=:title)");

It's hard to tell with your code, but try wrapping your foreach with

try {
    foreach(...) {
        ...
    }
} catch (PDOException $ex) {
    $ex->getMessage();
}

This should clearly tell you what's going on.