Check if PHP session has already started

Question

I have a PHP file that is sometimes called from a page that has started a session and sometimes from a page that doesn\'t have session started. Therefore when I have s

Answer 1

On PHP 5.3 this works for me:

if(!strlen(session_id())){
    session_name('someSpecialName');
    session_start();
} 

then you have. If you do not put the not at if statement beginning the session will start any way I do not why.