Is it recommended to use static classes for validations in PHP, or are there better alternatives for maintaining code integrity?

Using static classes for validations in PHP is a common practice, but it can lead to tight coupling and make the code harder to test and maintain. A better alternative is to use dependency injection and create validation classes that can be easily swapped out or extended. This approach improves code integrity and allows for better separation of concerns.

// Validation interface
interface ValidatorInterface {
    public function validate($data);
}

// Concrete validation class
class EmailValidator implements ValidatorInterface {
    public function validate($data) {
        return filter_var($data, FILTER_VALIDATE_EMAIL);
    }
}

// Implementation example
$email = "example@example.com";
$validator = new EmailValidator();
if ($validator->validate($email)) {
    echo "Email is valid";
} else {
    echo "Email is invalid";
}