php - Session redirect loop on login page work-around advice -

i looking placing code above in header.php include.

the first few lines of header has :

<?php session_start(); if(!isset($_session["loggedin"])){ header("location: login.php"); exit;} ?>

the unfortunate consequence of when user gets redirected login.php hit redirect loop.

would best way forward creating if statement along lines of pseudo:

if (page="login.php") {   //do not redirect login.php }

before session_start();?

you can wrap code

if(!isset($_session["loggedin"])){ header("location: login.php"); exit;}

in function such as:

function ensureloggedin() {   if (!isset($_session["loggedin"]))   {     header("location: login.php");     exit;   } }

then call function pages authentication required.

such calling function on secretpage.php redirect login.php if user not logged in.

Detect