4chan thread's images downloader (downloads each image from given thread, invocation like: php 4ctd.php thread_url dir_to_save_images)

4ctd.php

<?php
  $url = $argv[1];
  $prefix = (isset($argv[2])) ? $argv[2] : '';
  $fprefix = (isset($argv[3])) ? $argv[3] : '';
  $f = file_get_contents($url) or die('URL invalid');

  if (!is_dir($prefix))
    mkdir($prefix);
  
  $img = array();
  preg_match_all('|http://images.4chan.org/[a-z]+/src/([0-9]+\..{0,3})|', $f, $img);
  $img[0] = array_unique($img[0]);
  $img[1] = array_unique($img[1]);
  echo 'Found ' . count($img[0]) . " images.\n";
  foreach ($img[0] as $key => $url) {
    $path = $prefix . '/' . $fprefix . $img[1][$key];
    if (!file_exists($path)) {
      echo "Geting {$img[1][$key]}...";
      echo ($f = @file_get_contents($url)) ? ' Success.' : 'Failure.', "\n";
      file_put_contents($path, $f);
    }
    else
      echo "Ommiting {$img[1][$key]} as it exists.\n";
  }
?>