How to check if a session exists?

Question

PHP

I can't understand how it works. The code works like this, I check for isset PHPSESSID, then I have to make sure the sess_PHPSESSID file really exists. But how? I did not find a way, there is only one thought, to check files by name. But there must be an easier way. And if you write session_start(); a session will be created, check whether it is empty for any first value, it will be empty at least as well as delete it. But it looks like nonsense, create and delete. =\
The story of how: I was looking for something without knowing what I was going there without knowing where

Answer 1

The answer is

session_start();
if(isset($_SESSION['ххх'])) { 
echo "Сессия существует"; 
}
else { 
session_destroy();
echo "Такой сессии не существует";
}