php header not redirect to its url

Question

i need to redirect url

https://vivekp.co/server/apiurl/qwertyuiopl

but its redirect to

https://vivekp.co/server/apiurl/".$youtube_id

how solve this?

<?php
if (isset($_GET['urlid'])) {
$url = $_GET["urlid"];
//$url="https://youtube.com/watch?v=fbjfnjnfkjs";

preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', $url, $match);

$youtube_id = $match[1];

$nr="https://vivekp.co/server/apiurl/".$youtube_id;

header('location:$nr');

}else{
    echo "Error";
}
?>

Answer 1

Just set your header like,

header('location:'.$nr);

Answer 2

You should either take out the variable from '' or change it to ""

header("location:$nr");

or

header('location:'.$nr);