lib/MwbExporter/Storage/Storage.php
public function hasFile($filename)
    {
        return is_file($filename = $this->outDir.DIRECTORY_SEPARATOR.$filename) ? true : false;
    }
public function hasFile($filename)
    {
        return is_file($filename = $this->outDir.DIRECTORY_SEPARATOR.$filename) ? true : false;
    }
public function hasFile ( $ filename ) { return is_file ( $ filename = $ this -> outDir . DIRECTORY_SEPARATOR . $ filename ) ? true : false ; }
Check file if already exist.

@param string $filename  The file name
@return boolean
Check file if already exist .