Dynamic content, shows a 1 on each request - php

Question

With my function what I have written I try thereby 2 things.
The links should be called like this http://localhost/?login=Bla, Now it is like this http://localhost/login,php?login "Bla
Next I would have asked, in my function a 1 is given after each call. I just can't figure out where this comes from, I've been sitting on this problem for a long time.
Output with the 1
This is the code with which I can call the pages
function Seite($pagename, $lay){
function Seite($pagename, $lay){
$path = "$lay/$pagename.php";
if (file_exists($path)) {
openSeite($path);
}
}
function openSeite($pageurl){
$fc = require($pageurl);
echo $fc;
}
function echopage($slug, $fade){
// $slug = ?SLUG=Seite
// $fade = Ordner des Layout
$page = isset($_GET["$slug"]) ? $_GET["$slug"] : "error";
$contente = seite($page, "$fade");
echo $contente;
}
I call the content on the index.php with
<? echopage("login", "admin/layout"); ?>

Answer 1

isset($_GET["$slug"]) returns a 1 because it is set (true), write a traditional conditional with the echo inside the if statement.
*Better Yet assign your output to a variable and concatenate the values accordingly.
$output = NULL;
if(isset($_GET["$slug"]){
$contente = seite($page, "$fade");
$output .= $contente;
}else{
//handle error
}
HTML:
<?=$output?><!--Output your displayed text held in the variable-->
ISSUE:
$page = isset($_GET["$slug"]) ? $_GET["$slug"] : "error";
You are essentially returning the set value, which is 1 also true.
From php manual for value: Returns TRUE if var exists and has any value other than NULL. FALSE otherwise.
You can test this by simply writing out a line of code echo isset($var); and checking the test php page. Then try defining a variable and doing the same thing. $var = "this is set"; then echo isset($var);, you will get a 1.