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Wordpress - Last class on category navigation

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Copy this code and paste it in your HTML 
  1. ----------------------------------------------
  2. Functions.php
  3. ----------------------------------------------
  4.  
  5. function add_last_class($input) {
  6. 	if( !empty($input) ) {
  7.  
  8. 		$pattern = '/<li class="(?!.*<li class=")/is';
  9. 		$replacement = '<li class="last ';
  10.  
  11. 		$input = preg_replace($pattern, $replacement, $input);
  12.  
  13. 		echo $input;
  14. 	}
  15. }
  16.  
  17. ----------------------------------------------
  18. Header.php
  19.  
  20. Need to put echo=0 for it to work when calling 
  21. this function
  22. ----------------------------------------------
  23.  
  24.  
  25. <?php add_last_class(wp_list_categories('title_li=&echo=0'));?>

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