ubuntu failed to open stream permission denied on file code example
Example 1: failed to open stream permission denied in php
$ sudo chmod -R 0755 /var/www/html/mysite/images/
$ sudo chmod -R 0755 /var/www/html/mysite/tmp_file_upload/Example 2: ubuntu fopen failed to open stream: Permission denied
$ sudo chmod -R 777 /path/to/directory