What are common pitfalls when using PHP and MySQL together?

One common pitfall when using PHP and MySQL together is not properly sanitizing user input, which can leave your application vulnerable to SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries when interacting with the database. 

// Example of using prepared statements in PHP to prevent SQL injection

// Establish a connection to the MySQL database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Prepare a SQL statement with a placeholder for user input
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ?");

// Bind user input to the placeholder
$stmt->bind_param("s", $username);

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

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

// Get the results
$result = $stmt->get_result();

// Process the results
while ($row = $result->fetch_assoc()) {
    // Do something with the data
}

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

Keywords

SQL injection PDO prepared statements data validation error handling

Related Questions