use is_category()   see
 is_category() | Function | WordPress Developer Resources

 Determines whether the query is for an existing category archive page.

  https://developer.wordpress.org/reference/functions/is_category/

 also see

 Constructing An if Statement with is_category(); in archive.php (WordPress)
 I am trying to use an if statement with is_category() in order to build a bigger piece of code later. I can't get the code to recognize the if statement though. Basically below I've posted the coding
  https://stackoverflow.com/questions/11659177/constructing-an-if-statement-with-is-category-in-archive-php-wordpress

• if(is_category()) { 

• echo "category!"; 

• } 

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also see
the_category if/else statementI need to do the following: The sense if I have a class dportfolio - show a category dportfolio. Otherwise show usual category. I use: if ( class_exists( 'DPortfolio' ) ) { echo DPortfolio::

https://wordpress.stackexchange.com/questions/165984/the-category-if-else-statement

I need to do the following: The sense if I have a class dportfolio - show a category dportfolio. Otherwise show usual category.I use: 

• if ( class_exists( 'DPortfolio' ) ) { 

• echo DPortfolio::instance()->dportfolio_get_category(); 

• }; ?>