What is the best practice for evaluating form inputs in PHP?

When evaluating form inputs in PHP, it is important to sanitize and validate the data to prevent any security vulnerabilities or errors in the application. One common practice is to use filter_input() function along with filter_var() function to sanitize and validate the input data. 

// Example of evaluating form inputs in PHP
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

if($username && $email) {
    // Form inputs are valid, proceed with further processing
    // It is recommended to also check for additional validation rules as needed
} else {
    // Invalid form inputs, display an error message to the user
}

Keywords

validation sanitization filter_input htmlspecialchars error handling

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