What are common pitfalls to avoid when creating PHP forms that interact with a database?

Common pitfalls to avoid when creating PHP forms that interact with a database include not sanitizing user input, not using prepared statements to prevent SQL injection attacks, and not handling errors properly. To solve these issues, always sanitize user input before using it in database queries, use prepared statements to bind parameters securely, and implement error handling to catch and display any database errors. 

// Example of using prepared statements to interact with a database in PHP

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

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

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

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

// Check for errors
if($stmt->errorCode() !== '00000'){
    echo "Error: " . $stmt->errorInfo()[2];
}

Keywords

SQL injection form validation prepared statements CSRF protection error handling

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