gerbsi

I found som examples which i started to play with. Although I dont know if im on the right way.
Now im getting this error:
Argument #1 is not an array in footer.php .

This is how overview.php looks like

while( $myQuery->have_posts() ) :
						    $myQuery->the_post();
							$categoriesOverview = array();
							foreach( get_the_category() as $cat ) {
							$categoriesOverview[] = $cat->name  ;
							}

then in footer.php

while( $myQuery->have_posts() ) : $myQuery->the_post();
							$categoriesArchive = array();
							foreach( get_the_category() as $cat ) {
							$categoriesArchive[] = $cat->name  ;
							}
						   $result = array_intersect($categoriesOverwiev, $categoriesArchive);
						   echo $result;