1
There are several fatal assumptions here, and, a far better way to do it.
1. Declaring Functions inside Functions
This will cause a fatal error in a future version of PHP, makes it super difficult to debug. But worst, it's completely unnecessary.
This:
function foo () {
function bar () {
//
}
bar();
}
Should just be this:
function bar(...
1
If you were looking to make the fields required in the Wordpress admin form for adding new user as i understood from your question, where the output is not filterable, you could basically do what you described (adding form-required) on browser side
function se372358_add_required_to_first_name_last_name(string $type) {
if ( 'add-new-user' === $type ) {
...
1
If the plugin dynamically generates script and style handles so that you can't use wp_dequeue_script and wp_dequeue_style, as you said in a comment on another answer, then you would need to fork the plugin, and remove the section of code that is doing that, or else wrap it in a conditional so that it only loads on the specific page in question. (Fork, ...
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