What security measures should be implemented when processing user input in PHP forms?

When processing user input in PHP forms, it is crucial to implement security measures to prevent attacks such as SQL injection and cross-site scripting (XSS). One way to enhance security is by using functions like htmlspecialchars() to sanitize user input and prevent malicious code from being executed. 

// Sanitize user input using htmlspecialchars()
$user_input = htmlspecialchars($_POST['user_input']);

Keywords

SQL injection Cross-site scripting (XSS) Input validation Prepared statements Escaping data

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