Q: What is proper way to calling session_start() I have two shared host.
my problem is realated with calling session_start().
In my localhost and one of my shared host. session start works well with user notice that : cannot call header. then i used to write the below code:
<?php
if(! isset($_SESSION)){
 session_start()
}
?>

But in another host, it still echo message that "Notice: cannot start session()..."
also my problem that session doesn't starts in first visit. When I refresh my browser window again then starts session. what is relation between client and server side. again what is wrong with my session_start() ? please help me.
May anyone tell me that what is the proper way to calling a session_start() which will never fail. and where should I call. very top of the page or anywhere in the configuration file. a little example will help me surely.

A: Two simple things:
1. Always call session_start unconditionally.
2. Always call session_start before you output anything on the page.
So you should do it like this:
<?php
session_start();

// and now anything else

In particular, be aware that you can violate directive #2 in many different ways, e.g. by:


*

*Explicitly printing anything yourself with echo etc.

*Having any characters at all in your PHP script before the <?php tag

*Inlcuding other scripts that do the above


There are lots and lots of questions here on SO that describe point #2 and how to solve it.
