What are some common pitfalls when trying to retrieve and store data from a database in PHP?

One common pitfall when retrieving and storing data from a database in PHP is not properly sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements with parameterized queries when interacting with the database. 

// Connect to the database
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Prepare a statement with a parameterized query
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");

// Bind the parameter and execute the query
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();

// Fetch the results
$user = $stmt->fetch();

Keywords

SQL injection PDO prepared statements error handling data validation

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