Help with a site-scanning script

I have a specific URL that I would like a scaript to change 1 digit of the URL by counting up and every time the link is valid I want it to save that link and continute on. If the link is invalid it will just say page no availible, if it is valid then it will redirect to a new URL. Because of this I can't seem to get a viable PHP script. But maybe there is an easier way to do this...

Here is what I tried so far as was unsucessful with:

<?php

$context = stream_context_create(
array(
'http' => array(
'follow_location' => true
)
)
);

$start = $_GET['start'];
$end = $_GET['end'];

echo 'Testing urls starting with: ' . 'https://www.******.***/***/1234567/***' . $start . '<br/>';

for ($i = $start; $i <= $end; $i++) {

$url = 'https://www.*******.***/***/G964999422' . $i . '/***';



$html = file_get_contents($url, false, $context);

if ($i == $start)
echo $html;

PHP:

Please help!

 

<?php

// setup curl
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($curl, CURLOPT_HEADER, true);

// where to start and when to stop
$start = 1;
$end = 100;

foreach (range($start, $end) as $current) {
  // current url
  $url = "http://example.com/{$current}";

  curl_setopt($curl, CURLOPT_URL, $url);
  curl_exec($curl);

  // get http code from header
  $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);

  // check if http code is not successfull (read more here: https://en.wikipedia.org/wiki/List_of_HTTP_status_codes)
  if ($httpCode != 200) {
    echo "Something is wrong with {$url}\n";
  }
}

curl_close($curl);

PHP:

Also I noticed what you get $start and $end from $_GET array. Run this kind of scripts from terminal. This way you will see results instantly, without browser loading screen.