PHP Session not Saving

Question

I have this written at the very first line on every page of my website.

include(\"restd.php\");

and restd.php contains the following lines

Answer 1

you need declare $_SESSION['id'] :

file1.php

session_start();

$_SESSION['id'] = '123'  

file2.php

include 'file1.php'

if(isset($_SESSION['id']))
{

}
else
{
  header("location:index.php");
}