php - URL Shortener Issue -

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after submitting url via shortener. gives url custom code @ end rather redirecting want give error code:

not found

the requested url /1njchs not found on server.

additionally, 404 not found error encountered while trying use errordocument handle request.

i unsure file may have issue in have linked 3.

shortener.php:

<?php class shortener {     protected $db;      public function __construct() {         //demo purposes         $this->db = new mysqli('localhost', 'langers_langers', '^m%kt3&50pwn','langers_website');     }      protected function generatecode($num){         return base_convert($num, 10, 36);     }      public function makecode($url){         $url = trim($url);          if(!filter_var($url, filter_validate_url)) {             return '';         }          $url = $this->db->escape_string($url);          //check if url exists         $exists = $this->db->query("select code links url ='{$url}'");          if($exists->num_rows){             return $exists->fetch_object()->code;         } else {          //insert record without code         $insert = $this->db->query("insert links (url, created) values ('{$url}', now())");          //generate code based on id         $code = $this->generatecode($this->db->insert_id);          //update record         $this->db->query("update links set code = '{$code}' url = '$url'");          return $code;         }     }      public function geturl($code){          $code = $this->db->escape_string($code);          $code = $this->db->query("select url links code = '$code'");           if($code->num_rows){             return $code->fetch_object()->url;         }          return '';      } }  ?>

redirect.php

<?php require_once 'classes/shortener.php';  if(isset($_get['code'])) {     $s = new shortener;     $code = $_get['code'];      if($url = $s->geturl($code)) {         header("location: {url}");         die();     } }  header('location: index.php');

shorten.php

<?php session_start(); require_once 'classes/shortener.php';  $s = new shortener;  if(isset($_post['url'])) {     $url = $_post['url'];          if($code = $s->makecode($url)) {         $_session['feedback'] = "generated! short url is: <a href=\"http://r.langers.co/{$code}\">http://r.langers.co/{$code}</a>";         } else {           $_session['feedback'] = "there problem. invalid url, perhaps?";         } }  header('location: index.php');


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