What common mistakes do beginners make when using PHP to interact with SQL databases?

One common mistake beginners make when using PHP to interact with SQL databases is not properly sanitizing user input, leaving their application vulnerable to SQL injection attacks. To solve this issue, always use prepared statements and parameterized queries to safely handle user input. 

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

// Prepare a statement with a placeholder for user input
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the user input to the placeholder
$stmt->bindParam(':username', $_POST['username']);

// Execute the statement
$stmt->execute();

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

Keywords

SQL injection PDO prepared statements mysqli error handling

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