Что это значит?

public function createApacheHtaccessFile(){

		$fileName = ".htaccess";
		$filePath = $_SERVER['DOCUMENT_ROOT'].'/'.'sites/default/files/log';
		$handle = opendir( $filePath );

		if( $handle ){
			$fl = fopen( $filePath."/".$fileName, "a");
			fwrite($fl, "deny from all");
			fclose($fl);
		}
		else{
			$isCreatedDir = @mkdir( $filePath );

			if( $isCreatedDir ){
				$fl = fopen( $filePath."/".$fileName, "a");
				fwrite($fl, "deny from all");
				fclose($fl);
			}
			else{
				echo "It is not possible to create directory!";
				exit;
			}
		}
	}

	
	//create zip file from 30 log files and remove them
	
	function createArchive(){
		$size = $this->archieve_count;
		$zip = new ZipArchive();
		$filePath = $_SERVER['DOCUMENT_ROOT'].'/'.'sites/default/files/log';
		$zipFileName = $filePath.DIRECTORY_SEPARATOR.strftime("log_archieve_"."%d_%m_%Y_(%H-%M-%S)".".zip");

		if ( $zip->open( $zipFileName, ZipArchive::CREATE ) !== TRUE ) 
		{
	    	throw new Exception("Cannot create zip archieve");
		}

		for($i = 0; $i < $size; $i++){
			if (file_exists($filename = $filePath.DIRECTORY_SEPARATOR."log_".($i+1))) {
				$zip->addFile( $filename );
			}
		}
		$zip->close();

		if( file_exists($zipFileName) ){
			for($i = 0; $i < $size; $i++){
				if($this->isFileExists($filePath.DIRECTORY_SEPARATOR."log_".($i+1)))
					unlink( $filePath.DIRECTORY_SEPARATOR."log_".($i+1) );
			}
			
		}
	}