What are some common pitfalls to avoid when trying to implement this functionality in PHP?

One common pitfall when implementing functionality in PHP is not properly sanitizing user input, which can leave your application vulnerable to security risks such as SQL injection attacks. To avoid this, always validate and sanitize user input before using it in your code. 

// Sanitize user input using the filter_var function
$user_input = filter_var($_POST['user_input'], FILTER_SANITIZE_STRING);

Keywords

SQL injection XSS attacks error handling session management code optimization

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