Security matters. How can I guard against things like SQL injection or cross-site scripting? It will be really helpful if somebody could help.

The best way to prevent SQL injection attacks is to make sure that all strings passed into SQL queries, especially if they are derived from user-generated input, are properly escaped. If using MySQL with PHP, you can use the mysqli::real_escape_string() function. Other databases have equivalent functions.

To prevent cross-site scripting attacks, you similarly want to make sure that all text derived from user-generated input is HTML escaped. If using PHP, you can use the htmlspecialchars() function.

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