Filter facets before rendered

facetwp_facet_render_args.php

	/**
	 *		Remove taxonomy terms that aren't a parent/child of the current page
	 *
	 *
	 *
	 */
	
	
	public function facetwp_facet_render_args( $args ) {
	
		//vdump( $args );
		

		if ( $args['facet']['name'] !== 'industry_sector' /* && !is_tax( 'industry_sector' )*/ && !isset( $_GET['_industry_sector'] ) ) {

			return $args;

		} 



		//This is the page we're on
		if ( !empty( $_GET['_industry_sector'] ) ) {
			
			$current_page_slug = $_GET['_industry_sector'];
		
		} else {
			
			return $args;
		}

		$current_page_slug = explode( ',', $current_page_slug );

	//	err_dump( $current_page_slug, 'current page slug' );
		
		//err_dump( $args, 'facetwp_facet_render_args with current page slug: ' . $current_page_slug[0] );


		//Loop through and find this in the values list. Get the parent ID. Then loop through again and keep the parent and any others within that belong it it.
		$keepers = [];
		$is_parent = false;
		$reference_value = null;



		if ( !empty( $args['values'] ) ) {

			
			
			foreach ( $args['values'] as $k => $value ) {

				if ( $value['facet_value'] == $current_page_slug[0] ) {

					$reference_value = $value;

					//unset( $args['values'][$k] );

					if ( $value['parent_id'] == 0 ) {

						$is_parent = true;
						//$keepers[] = $value;

					} 

				}

			}



			foreach ( $args['values'] as $k => $value ) {




				if( $is_parent ) {

					if ( $reference_value['term_id'] == $value['parent_id'] || $reference_value['term_id'] == $value['term_id']  ) {
						$keepers[] = $value;

					} else {

						unset( $args['values'][$k] );
					}

				} else {


					if ( $reference_value['parent_id'] == $value['parent_id'] || $reference_value['parent_id'] == $value['term_id']  ) {

					$keepers[] = $value;
					} else {
						unset( $args['values'][$k] );
					}


				}

			}



			//err_dump( $keepers, 'My keepers for current_page_slug: ' . $current_page_slug[0] );

			$args['values'] = $keepers; //array_values( $args['values'] );
		
		}
		
		
		return $args;	

	}