if(empty($name)){ echo "Name is required"; }
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "Invalid email format"; }
if (strlen($password) < 6) { echo "Password must be at least 6 characters long."; } elseif (!preg_match("#[0-9]+#", $password)) { echo "Password must include at least one number!"; } elseif (!preg_match("#[a-zA-Z]+#", $password)) { echo "Password must include at least one letter!"; }The PHP Validation library is not a separate package or library, as it is already included in PHP. Some popular third-party libraries for PHP Validation are Respect\Validation, Symfony Validator, and PHP Filter.