src/includes/classes/Core/Template.php
protected function parentVars(string $file = null): array
    {
        if (isset($file)) {
            return $this->parent_vars[$file] ?? [];
        }
        $closest_ancestor_vars = end($this->parent_vars);
        return $parent_vars    = $closest_ancestor_vars ?: [];
    }
protected function parentVars(string $file = null): array
    {
        if (isset($file)) {
            return $this->parent_vars[$file] ?? [];
        }
        $closest_ancestor_vars = end($this->parent_vars);
        return $parent_vars    = $closest_ancestor_vars ?: [];
    }
Parent template vars.

@since 150424 Initial release.

@param string|null $file Template file.

@return array Parent template vars.