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The warning is regarding the following part of your code: __( ). In WP __ is actually a function for translation purposes. From a short look in the manual, we can see that the __() function usage is: <?php $translated_text = __( $text, $domain ); ?> And that the $text parameter is required. $text (string) (required) Text to translate. ...


To add to Peter's comment, it is very much depending on the technology you use which in turn might depend on the software architecture. If you can create a condition in which you can serve cached pages 99% of the time (by using caching plugins or varnish in front of your site) then you will be able to actually handle a lot of traffic with a single server ...

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