Meta Slider Post Feed - Restrict to current category

gistfile1.txt

/**
 * Alter the post feed query arguments to restrict the results to posts
 * tagged to the current category.
 *
 * REQUIRES: Meta Slider Pro 2.4.5+
 */
function metaslider_restrict_to_current_category( $args, $slide, $slider_settings, $slide_settings ) {

	// check slide ID so we only apply this functionality where it's needed
	if ( $slide->ID == 101 && is_category() ) {

		// remove any existing restrictions
		if ( isset ( $args['tax_query'] ) ) {
			unset( $args['tax_query'] );
		}
		
		// restrict to posts tagged to the current category
	        $args['tax_query'][] = array(
	            'taxonomy' => 'category',
	            'field' => 'id',
	            'terms' => get_query_var( 'cat' )
	        );

	}

	return $args;
}
add_filter( 'metaslider_post_feed_args', 'metaslider_restrict_to_current_category', 10, 4);