What are common mistakes to avoid when inserting data from a form into a database using PHP and MySQL?

One common mistake to avoid when inserting data from a form into a database using PHP and MySQL is not properly sanitizing the input data, which can lead to SQL injection attacks. To prevent this, always use prepared statements with parameterized queries to securely insert data into the database. 

// Establish a database connection
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Prepare an SQL statement with placeholders for the data
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");

// Bind the form data to the placeholders
$stmt->bindParam(':username', $_POST['username']);
$stmt->bindParam(':email', $_POST['email']);

// Execute the prepared statement to insert the data
$stmt->execute();

Keywords

SQL injection prepared statements data validation error handling database connection

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