What are common pitfalls when working with PHP scripts that extract data from a Magento shop database?

Common pitfalls when working with PHP scripts that extract data from a Magento shop database include not properly sanitizing user input, not handling errors or exceptions gracefully, and not optimizing queries for performance. To solve these issues, always use prepared statements to prevent SQL injection attacks, implement error handling to catch and log any potential issues, and optimize queries by only selecting the necessary data. 

// Example of using prepared statements to sanitize user input
$productId = $_GET['product_id'];
$stmt = $pdo->prepare('SELECT * FROM products WHERE id = :id');
$stmt->bindParam(':id', $productId, PDO::PARAM_INT);
$stmt->execute();
$product = $stmt->fetch();

// Example of error handling
try {
    $pdo = new PDO('mysql:host=localhost;dbname=magento', 'username', 'password');
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

// Example of optimizing queries
$stmt = $pdo->query('SELECT name, price FROM products');
while ($row = $stmt->fetch()) {
    echo $row['name'] . ' - ' . $row['price'] . '<br>';
}

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