Warning: fopen(D:\xampp\htdocs/tongji.txt): Failed to open stream: Permission denied in D:\xampp\htdocs\tongji1.php on line 4

Fatal error: Uncaught TypeError: flock(): Argument #1 ($stream) must be of type resource, bool given in D:\xampp\htdocs\tongji1.php:6 Stack trace: #0 D:\xampp\htdocs\tongji1.php(6): flock(false, 2) #1 {main} thrown in D:\xampp\htdocs\tongji1.php on line 6