private function get_category_ids( $arg ) {

		$categories   = explode( ',', $arg );
		$category_ids = [];
		foreach ( $categories as $post_category ) {
			if ( trim( $post_category ) ) {
				if ( is_numeric( $post_category ) && (int) $post_category ) {
					$category_id = category_exists( (int) $post_category );
				} else {
					$category_id = category_exists( $post_category );
				}
				if ( ! $category_id ) {
					WP_CLI::error( "No such post category '{$post_category}'." );
				}
				$category_ids[] = $category_id;
			}
		}
		// If no category ids found, return exploded array for compat with previous WP-CLI versions.
		return $category_ids ?: $categories;
	}
private function get_category_ids( $arg ) {

		$categories   = explode( ',', $arg );
		$category_ids = [];
		foreach ( $categories as $post_category ) {
			if ( trim( $post_category ) ) {
				if ( is_numeric( $post_category ) && (int) $post_category ) {
					$category_id = category_exists( (int) $post_category );
				} else {
					$category_id = category_exists( $post_category );
				}
				if ( ! $category_id ) {
					WP_CLI::error( "No such post category '{$post_category}'." );
				}
				$category_ids[] = $category_id;
			}
		}
		// If no category ids found, return exploded array for compat with previous WP-CLI versions.
		return $category_ids ?: $categories;
	}
private function get_category_ids ( $ arg ) { $ categories = explode ( ',' , $ arg ) ; $ category_ids = [ ] ; foreach ( $ categories as $ post_category ) { if ( trim ( $ post_category ) ) { if ( is_numeric ( $ post_category ) && ( int ) $ post_category ) { $ category_id = category_exists ( ( int ) $ post_category ) ; } else { $ category_id = category_exists ( $ post_category ) ; } if ( ! $ category_id ) { WP_CLI :: error ( "No such post category '{$post_category}'." ) ; } $ category_ids [ ] = $ category_id ; } } // If no category ids found, return exploded array for compat with previous WP-CLI versions. return $ category_ids ? : $ categories ; }
Resolves post_category arg into an array of category ids.

@param string $arg Supplied argument.
@return array
Resolves post_category arg into an array of category ids .