You are browsing the Symfony 4 documentation, which changes significantly from Symfony 3.x. If your app doesn't use Symfony 4 yet, browse the Symfony 3.4 documentation.
The Symfony Polyfill / Ctype Component
The Symfony Polyfill / Ctype Component¶
This component provides
ctype_*functions to users who run PHP versions without the ctype extension.
$ composer require symfony/polyfill-ctype
Alternatively, you can clone the https://github.com/symfony/polyfill-ctype repository.
If you install this component outside of a Symfony application, you must
vendor/autoload.php file in your code to enable the class
autoloading mechanism provided by Composer. Read
this article for more details.
Once this component is installed in your application, you can use the following functions, no matter if the PHP Ctype extension is installed or not in your server.
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.