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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. ...


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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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