What are the recommended methods for sanitizing and validating user input before processing it in PHP scripts?

Sanitizing and validating user input is crucial to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks in PHP scripts. One recommended method is to use functions like filter_input() to sanitize input data and validate it using functions like filter_var(). Additionally, you can use prepared statements when interacting with a database to protect against SQL injection. 

// Sanitize and validate user input before processing
$input = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);

if (filter_var($input, FILTER_VALIDATE_EMAIL)) {
    // Process the input
    echo "Input is valid: " . $input;
} else {
    // Handle invalid input
    echo "Invalid input";
}

Keywords

filter_input htmlspecialchars filter_var validation sanitization

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