How to resolve problem of session_start on Linux

[Vidyadhar]

I had built my website in php, earlier on Windows platform and amply used session_start function. Later I shifted to Linux hosting and realized that each session_start is displaying a warning that headers already sent etc. Now I searched google and came to know that this problem comes when BOM or any other char has been sent prior to session_start. But BOM is inevitable in my case as it is a multilingual website. Now i came to know that changing php5.ini and setting some option may help avoid the problem but since this is a shared hosting, i had to search for how to set my own php.ini, i found too, but unfortunately php.ini options are also not taking effect (this is checked by using phpinfo function). Can somebody please help rescue the situation? Thanks for reading this.

[mac_gyver]

on your windows development system, go into your php.ini and turn output_buffering OFF so that the code you develop will work without relying on one of php's non-portable short-cuts.

[PravinS]

you can put session_start() at top of your page

[Vidyadhar]

Thanks for the replies. Problem is not that I am using WIndows system, in fact I was hosting and developing on the Windows previously and now both are on Linux. But I don't know why same php script now not working on Linux. I think some setting is required to make session_start work properly but I don't know what exactly it is. @PravinS, session_start is on the top already.

[mac_gyver]

if you post the important part of the error message (the line number where the output is occurring at), it will help someone to help you with what is causing the problem.