What are the potential security issues to consider when transitioning from a "Homepage-Creator" to coding in HTML/PHP?

One potential security issue to consider when transitioning from a "Homepage-Creator" to coding in HTML/PHP is the risk of SQL injection attacks. To prevent this, always use prepared statements when interacting with a database to sanitize user input and prevent malicious SQL queries. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();

Keywords

Cross-site scripting SQL injection file inclusion session hijacking data validation

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