I’m not sure what you’re trying to achieve. You can’t add PHP to a directly to WordPress page content in the visual editor or the text editor so that wouldn’t work, but maybe you’ve not used the correct terminology in your question.
If you mean that you want to add the tabs to a template rather than the content, this is possible, but the best way is to use the shortcodes – these can be included in your php code using using the do_shortcode function.
example:
<?php
do_shortcode("[tabby title='First Tab']");
// Functions to add the content of the first tab go here
do_shortcode("[tabby title='Second Tab']");
// Functions to add the content of the second tab go here
do_shortcode("[tabby title='Third Tab']");
// Functions to add the content of the third tab go here
do_shortcode("[tabbyending]");
?>