February 12, 2011 
Definition:
function is_category( $category = '' ) {}
Is the query for a category archive page?
If the $category parameter is specified, this function will additionally check if the query is for one of the categories specified.
Parameters
- mixed $category: Optional. Category ID, name, slug, or array of Category IDs, names, and slugs.
Source code
function is_category( $category = '' ) {
if ( !$this->is_category )
return false;
if ( empty($category) )
return true;
$cat_obj = $this->get_queried_object();
$category = (array) $category;
if ( in_array( $cat_obj->term_id, $category ) )
return true;
elseif ( in_array( $cat_obj->name, $category ) )
return true;
elseif ( in_array( $cat_obj->slug, $category ) )
return true;
return false;
}
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