Check where page is being accessed from

Question

I have two PHP Pages, an index.php and a content.php. I am using the code include("content.php"); on the index.php file. Is it possible to check whether the user is on index.php or did he go straight to content.php ?

Basically what I want to do is display content.php on index.php but if the user went directly to content.php then I don't want the script to do anything.

Answer 1

Add this to the page that you want to only be included

<?php
if(!defined('MyConst')) {
    die('Direct access not permitted');
}
?>

then on the pages that include it add

<?php
    define('MyConst', TRUE);
?>

Answer 2

index.php

$chk = 1
include("content.php");

content.php

if ($chk < 1){
  include('index.php');
  exit;
}