$email = "example@example.com"; if (filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "Email is valid"; } else { echo "Email is not valid"; }
$url = "https://example.com"; if (filter_var($url, FILTER_VALIDATE_URL)) { echo "URL is valid"; } else { echo "URL is not valid"; }
$value = 123; if (filter_var($value, FILTER_VALIDATE_INT)) { echo "Value is valid"; } else { echo "Value is not valid"; }The PHP Validate library is part of the PHP core, so it does not need to be installed separately.