What are best practices for handling user input in PHP forms?

It is important to validate and sanitize user input in PHP forms to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. One common best practice is to use PHP's filter_input() function to sanitize input data and validate it against a specific type of input. 

// Validate and sanitize user input in a PHP form
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

// Check if input is valid
if ($username && $email) {
    // Process the form data
    // ...
} else {
    // Handle invalid input
    echo "Invalid input. Please try again.";
}

Keywords

Sanitization Validation Cross-site scripting (XSS) SQL injection Form validation

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