What are common pitfalls in creating a PHP login system with MySQL?

One common pitfall in creating a PHP login system with MySQL is not properly sanitizing user input, which can lead to SQL injection attacks. To solve this issue, use prepared statements or parameterized queries to prevent malicious SQL queries from being executed. 

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

Keywords

PHP MySQL login system security vulnerabilities SQL injection

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