malformed header from script. Bad header=1: index.php

Question

I have a website which is a few years old now, it basically offers downloads.

Anyway since moving server people can not download files because its now giving a error

Answer 1

The problem is in

header('Content-Length: ' . filesize($file) + 1);

Dot is evaluated before plus so your code is string + 1, result is 1 and this causes that 1 is sent as header. Correct code should be

header('Content-Length: ' . filesize($file));

because according to this page http://www.php.net/manual/en/function.readfile.php no +1 is used. Other solution is

header('Content-Length: ' . (filesize($file) + 1));

which will work as you want.