this what ive got does not work ?php

//require 'apt_key.php';
if (isset($_GET['filter']))
{
    $url = "https:/api.themoviedb.org/3/movie/550?api_key=THE_KEY&language=en-US&append_to_response=release_dates&query=" .urlencode($_GET['filter']);
$client = curl_init($url);
curl_setopt($client, CURLOPT_RETURNTRANSFER,true);
$response = curl_exec($client);
$result = json_decode($response, true);

$number_of_results = sizeof($result["results"]);
$default_number_of_results = 5;