Allow PHP page only if set the correct url - php

Question

I am trying to figure out how to allow PHP index only if it matches the URL I put in, something like this:
Example if you put in URL site.com/myfile.php I want to show message like 404 Error or something
But if you put site.com/myfile.php?=123 to show the page content.

Answer 1

I think it might be considered bad practice to send someone to a 404 when the page that they are accessing does actually exist, it's only a variable that they are missing.
Firstly, I'd expect to see something like
site.com/myfile.php?variablename=123
instead.
If you absolutely wanted to, you could at the top of your file then add a:
if(!isset($_GET['variablename']){
header('location:404.php');
}
Where 404.php is your 404 file that you'd like the user to see.
Hope that helps?

Answer 2

You could run a conditional looking for the request info, i would make it specific like using a ?page_id=123
<?php
if ( $_REQUEST AND isset($_REQUEST['page_id']) )
{
// SHOW PAGE CONTENT
}
else
{
// RETURN 404
}
?>

Answer 3

You would have to test the $_GET parameters.
if (!$_GET) {
echo "404 Error"; //or redirect using header();
} elseif ($_GET['key'] == 'value') {
//code here
}
I see you are using ?=123, I'm not 100% on if that will work, but it's easier (IMO) to have a key=>value association in the URL.

Answer 4

This should be enough for what you need. If there are other requirements let us know.
if(!isset($_GET)){
//do whatever you want to validate the get input provided.
} else {
header("HTTP/1.0 404 Not Found");
}

Answer 5

Well first of all this ?=123 might be an issue because when ?=123 is passed then it should be stored somewhere, it could be like this ?uid=123 and then you retrieve it in a variable through the get method and then check its value and accordingly redirect the user.
You can do something like this
if(isset($_GET['uid']))
{
refresh(to whatever location you want);
}
else
refresh(to some other location);
but if you want the error 404 something then its not possible according to me, because the values will be sent to a page that exists and if the page exists then the server cannot give a "not found" error.

Answer 6

By simply comparing a string.
if (#$_GET['secret'] != 'mysecret'){
header('location: noaccess.php'); //redirect the user to access denied page.
die(); // terminate the script. A
}
// The rest of the page
Or to keep everything in one file:
if ((isset($_GET['secret'])) && ($_GET['secret'] == 'mysecret')){
// Show the page
} else {
// Show an error message
}
site.com/myfile.php?secret=mysecret