How to include external php file in laravel?

Question

Laravel

Good day!
How to include external php file in laravel?
Or how can I convert

<?php
    header('Content-Type: application/json');
  $url = "";
  if( isset($_GET['url']))
  {
    $url = $_GET['url'];
  }
  if( isset($_POST['url']))
  {
    $url = $_POST['url'];
  }
  //print_r($_GET);
  //echo"$url";
  $address = str_replace("@", "&",str_replace("!", "?", str_replace("~", "=", $url)));
  //echo $address;
  $ch = curl_init($address); //начинаем сеанс работы с cURL; указываем, что будем работать со скриптом по указанному адресу 
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  curl_setopt($ch, CURLOPT_POST, 0); //посылаем методом GET 
  $json = curl_exec($ch); //выводим результат в JSON
  $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  curl_close($ch); // завершаем сеанс 
  //echo "$httpcode";
  //echo "$json";
    header("HTTP/1.1 $httpcode OK");
  $obj = json_decode($json);
  echo json_encode($obj);
?>

In laravel

Answer 1

In general, libs and so on can be included in the composer.json files section of autoload.
But what you have is better to transfer to the controller with native methods.

Answer 2

google models and MVC framework

Answer 3

get and post https://laravel.ru/docs/v5/requests
validation https://laravel.ru/docs/v5/validation
print_r() change to dd()
curl to guzzle docs.guzzlephp.org/en/latest
but it's better to repeat this laravel.su/docs/5.2/quickstart first and then return to your script