What are the best practices for handling user input and data validation in PHP scripts to prevent exploitation?

User input and data validation are crucial in preventing exploitation in PHP scripts. To ensure security, always sanitize and validate user input before using it in your application. Use functions like filter_input() and filter_var() to sanitize input and validate against expected formats. Additionally, consider using prepared statements or parameterized queries when interacting with databases to prevent SQL injection attacks. 

// Sanitize and validate user input
$input = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);
if ($input) {
    // Process the sanitized input
    echo "User input: " . $input;
} else {
    // Handle invalid input
    echo "Invalid input";
}

Keywords

SQL injection cross-site scripting filter_input htmlspecialchars validation libraries

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