public function save()
    {
        $host = $this;
        array_map(function ($value) use ($host) {
            $host->saveSubset($value);
        }, $this->fileBasedSubsets);
    }
public function save()
    {
        $host = $this;
        array_map(function ($value) use ($host) {
            $host->saveSubset($value);
        }, $this->fileBasedSubsets);
    }
public function save ( ) { $ host = $ this ; array_map ( function ( $ value ) use ( $ host ) { $ host -> saveSubset ( $ value ) ; } , $ this -> fileBasedSubsets ) ; }
Persist all subsets
Persist all subsets