The below isn’t really about WPPizza in particular but WordPress in general, and I feel the need to state why removing version numbers from WordPress javascript or css files – either by some custom filtering, using some plugin or even having this kind of thing in-built into your theme – is just a very bad idea in my opinion.
The 2 main arguments are usually as follows:
More importantly though, YOU DO NOT ACTUALLY WANT js/css files to be served from cache when they have changed.
Consider the following:
You might even break styles/scripts entirely (depending on how version numbers are removed)
$ui = $wp_scripts->query('jquery-ui-spinner');//ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.min.css//ajax.googleapis.com/ajax/libs/jqueryui/".$ui->ver."/themes/smoothness/jquery-ui.min.css//ajax.googleapis.com/ajax/libs/jqueryui//themes/smoothness/jquery-ui.min.css which will produce nothing but a 404 and an entire stylesheet is missing from your site
Of course, I do not claim to be the ultimate reference regarding the above and there may well be ways to remove version numbers more selectively or other ways to avoid the above scenarios.
The above is only a summary as to what I have seen being done countless times and wanted to share this here to make people think twice about doing this or if they choose to do so to be aware of the possible consequences.
Thanks for reading…..
/***
email subject lines are made up of 3 parts
filter each part as required based on your preferences
****/
add_filter('wppizza_filter_email_subject', 'myprefix_filter_email_subject', 10, 2);
function myprefix_filter_email_subject($subject, $order_formatted){
/*
defaults
//dynamic depending on settings in wppizza order form , but typically its the site name plus perhaps some personal info */
$subject['prefix'] = '[--------- conditional/dynamic text ---------------]' ;
//from wppizza->localization
$subject['main'] = $order_formatted['localization']['your_order'];
//date/time according to wordpress date/time settings */
$subject['suffix'] = date_i18n($order_formatted['date_format']['date'], WPPIZZA_WP_TIME)." ".date_i18n($order_formatted['date_format']['time'], WPPIZZA_WP_TIME)."";
//This typically produces something like
"My Shop Your Order March 25, 2020 6:31 pm"
where:
$subject['prefix'] = 'My Shop';
$subject['main']= 'Your Order';
$subject['suffix']= 'March 25, 2020 6:31 pm';
*/
// example: if you want to not add the date/time at the end
$subject['suffix'] = '';
//or simply
unset($subject['suffix']);
// example: change the typically main "My Order"
$subject['main'] = 'whatever it is you want';
// example: add something after it all
$subject['some_additional_key'] = 'something added to the end of the subject line;
/*
for conditionals depending on order values,
you can use the 2nd "$order_formatted" parameter
*/
return $subject;
}
in your wp-config.php you will find a line that reads (most likely) like this:
define('WP_DEBUG', false);
REPLACE this with (or if it does not exist simply add the below)
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);/*this should NEVER be true for production sites*/
Note: this MUST be before /* That's all, stop editing! Happy blogging. */
Which will generate a file “wp-content/debug.log” if and when any errors are encountered.
Check this file for errors if you need to find out where things might go wrong
Note that in many cases a lot more information/help is available in the help screens of the plugin 
If you see some “500 Internal server errors” in there, check your server error log. In many cases these are caused by uploading a plugin with the wrong permissions – especially if you add plugins by ftp instead of using the standard wordpress plugin installer. You should also aim to fix any other javascript errors you may have, although some might be more problematic than others
If you have issues with WPPizza – or WordPress in general for that matter – I would highly recommend the following resource to narrow down where your issues might be
As I could not say this any better, forgive me for simply providing the link above. I would however especially recommend the “Troubleshooting Plugins” section about 2 thirds down on that page.
Of course, if you have followed the recommendations on that page without being able to solve your problem and still have issues with WPPizza, please get in touch via the common channels (forum, contact form, emails)