What are some potential pitfalls or errors that could occur in the provided PHP code when inserting data into a database?

One potential pitfall in the provided PHP code is the lack of proper sanitization of user input, which can make the application vulnerable to SQL injection attacks. To prevent this, it is recommended to use prepared statements with parameterized queries to securely insert data into the database. 

// Using prepared statements to insert data into the database securely

// Assuming $conn is the database connection object

// Prepare the SQL statement with placeholders
$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");

// Bind parameters to the placeholders
$stmt->bind_param("ss", $username, $email);

// Set the parameters and execute the statement
$username = "JohnDoe";
$email = "johndoe@example.com";
$stmt->execute();

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

Keywords

SQL injection PDO prepared statements error handling data validation

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