Same problem in alpha2-5
You need to add the 'filter' extension to your PHP. As you are using Gentoo, add the "filter" USE flag and emerge php again. If this is your hosting provider then ask them to add the filter php extension.
A couple of related issues:#395744: "Call to undefined function filter_var()" during fresh install#641408: PHP extensions and PDO functionality should be checked at installation.
So hard and so simple - thank you vmuch!
I add "filter" to /etc/portage - package.use and then "emerge php"
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