Why doesn't the md5_file() function work; in php on hosting?

Question

PHP

There is a .txt file on the hosting server, in php I am trying to get the hash of this file with the above function. The function returns an empty response. Everything works on open server, but not on hosting. Hosting on ubuntu 16.04, open server was on windows

Answer 1

The most banal option - you specify the path to the file incorrectly. Maybe you do not take into account the case of the file name (which in other OSes other than Windows matters)

Answer 2

Возможно, потому что соответствующий модуль не установлен :)