protected function parse_args() {

		$statuses = $this->arguments['statuses'];

		// Allow strings to be submitted when only requesting one status.
		if ( is_string( $statuses ) ) {
			$statuses = array( $statuses );
		}

		// Ensure only valid statuses are used.
		$statuses = array_intersect( $statuses, array_keys( llms_get_enrollment_statuses() ) );

		// No statuses should return original default.
		if ( ! $statuses ) {
			$statuses = array_keys( llms_get_enrollment_statuses() );
		}

		$this->arguments['statuses'] = $statuses;

		// Allow numeric strings & ints to be passed instead of an array.
		$post_ids = $this->arguments['post_id'];
		if ( ! is_array( $post_ids ) && is_numeric( $post_ids ) && $post_ids > 0 ) {
			$post_ids = array( $post_ids );
		}

		foreach ( $post_ids as $key => &$id ) {
			$id = absint( $id ); // Verify we have ints.
			if ( $id <= 0 ) { // Remove anything negative or 0.
				unset( $post_ids[ $key ] );
			}
		}
		$this->arguments['post_id'] = $post_ids;

	}