How can PHP developers ensure proper data validation and sanitization when handling user input in forms?

To ensure proper data validation and sanitization when handling user input in forms, PHP developers can use functions like filter_input() and filter_var() to validate input data against predefined filters (such as email, URL, integer, etc.) and sanitize it to prevent SQL injection and cross-site scripting attacks. 

// Example of data validation and sanitization using filter_input() and filter_var()

$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
if (!$email) {
    // Invalid email address
    // Handle error or display a message to the user
}

$name = filter_input(INPUT_POST, 'name', FILTER_SANITIZE_STRING);
// Now $name is sanitized and can be safely used in the application

Keywords

filter_input filter_var htmlspecialchars prepared statements validation

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