private function unzipFiles()
{
    $this->fileNames = array("file1.zip");//this comes dynamically
    $this->terminalPrint("Starting to unzip files...");
    foreach($this->fileNames as $file)
    {
        $this->terminalPrint("Unzipping $file");
        ..... //other operations
    }
    $this->terminalPrint("Finished uzipping files...");