A common practice in PHP forms is to validate user inputs such as email and URL to prevent ______.

A common practice in PHP forms is to validate user inputs such as email and URL to prevent Cross-Site Scripting (XSS) attacks. By validating user inputs, you can ensure that any malicious script or code is not executed when displaying the user's input on the webpage. This helps to protect the application and its users from potential security vulnerabilities. For more details on web security in PHP, check: php.net/manual/en/security.php