What are some common pitfalls to avoid when inserting user data into a MySQL database using PHP?

One common pitfall to avoid when inserting user data into a MySQL database using PHP is SQL injection attacks. To prevent this, always use prepared statements with parameterized queries to sanitize user input and prevent malicious SQL code from being executed. 

// Connect to the database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Prepare a SQL statement with a parameterized query
$stmt = $mysqli->prepare("INSERT INTO users (username, email) VALUES (?, ?)");

// Bind parameters and execute the statement
$stmt->bind_param("ss", $username, $email);

// Set the user input
$username = $_POST['username'];
$email = $_POST['email'];

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

// Close the statement and database connection
$stmt->close();
$mysqli->close();

Keywords

SQL injection data validation prepared statements PDO escaping data

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