你可以在这里找到更多的信息和例子-〉https://www.w3schools.com/php/php_file_open.asp

public function updateData(){
             # Running this function each time it will save the timestamp in a text file.
             $path2file = "/docs/";
             $fileName = "timestamp.txt";
             $data = time()."".PHP_EOL; // PHP_EOL - new line
             $fp = fopen($path2file.$filename, 'a');
             fwrite($fp, $data);
        }