How to redirect to another page if it is accessed directly? [PHP]

Question

How to redirect a page to the homepage if it is accessed directly (Without a variable)? Suppose we have a link "example.com/site?website=$_GET[variable]" if it is accessed like this then it is OKAY! but if someone tries to access it directly using this link "example.com/site" Then it should redirect to the Homepage. How to do it?

Answer 1

if(isset($_GET['variable']) && !empty(trim($_GET['variable']))) 
{
//your rest of code
} else {
header("Location:redirectpage.php");
}

Answer 2

You just need to check at the top of your script if the global $_GET variable is set (which it will be if any query string variables are set) and redirect if not.

if(!isset($_GET)):
   header("Location: /");
   exit(); 
endif;

You can just add that at the top of your code and if the query string is set then your code will carry on as normal.

Answer 3

This is supposed to be a comment but i have a low reputation here.

I am a bit confused. But why dont you just check for the existence of the variable in the link Like:

<?php

//add code below on every page or have it in a file and include everywhere $access = false;

if(isset($_GET['variable_name'])){
//obviously any one can pass any funny variable, so you will need to match it with your database to verify or the variable might be a unique word of some sorts.
   $access = true;
}else{
  $access = false;
}

if($access == false){
    die('No access to view this page');
}