manga_downloader.php

<?php

chdir(__DIR__);

define('LAST_FILE', 'last_manga.json');
define('MANGA_DIR', 'manga');


$names = [];
$names[] = 'terra-formars';
$names[] = 'fairy-tail';
$names[] = 'one-piece';
$names[] = 'fairy-tail-gaiden-road-knight';
$names[] = 'one-piece-party';
$names[] = 'fairy-tail-sabertooth';
$names[] = 'fairy-tail-gaiden-kengami-no-souryuu';
$names[] = 'fairy-girls';
// $names[] = 'fairy-tail-zero';
// $names[] = 'fairy-tail-blue-mistral';
// $names[] = 'fairy-tail-christmas-special';
// $names[] = 'fairy-tail-side-story';
// $names[] = 'fairy-tail-special';
// $names[] = 'tale-of-fairy-ice-trail-koori-no-kiseki';

$name = $names[rand() % count($names)];
$chapter = '1';
$page = 1;
$limit = 100;

echo "downloading: $name\n";

for($i=0;$i<$limit;$i++) {

  $nextJob = getJob($name,+1);

  $chapter = $nextJob['chapter'];
  $page = $nextJob['page'];
  $url = "http://www.mangapanda.com/$name/$chapter/";

  $html = @file_get_contents($url.$page);
  $lastPage = subStringBetween($html,'/select> of ','</div');

  if(strlen($lastPage) < 1 && strlen($lastPage) > 3) {
    echo "done\n";
    exit();
  }

  $imageUrl = grabImageUrl($html);
 
  $isSuccess = false; 
  $download = false;
  for ($j=0; $j<2; $j++) {
    $download = downloadImageAndSave($imageUrl,$name,$chapter,$page,$lastPage);
    if($download === FALSE) {
      echo "failed $name $chapter $page\n";
      sleep(3);
    } else {
      echo 'downloaded: ' . $download . "\n";
      saveJobDone($name,$chapter,$page,$lastPage);
      $isSuccess = true;
      break;
    }
  }
  
  if (!$isSuccess && $page === 1) {
    echo "up to date\n";
    break;
  }

  sleep(rand()%5);
}


function getJob($name,$offset=0){
  $lastData = json_decode(@file_get_contents(LAST_FILE), true);
  $nextChapter = 1;
  $nextPage = 1;
  $lastChapterPage = 0;

  if(isset($lastData[$name])) {
    $nextChapter = $lastData[$name]['chapter'];
    $nextPage = $lastData[$name]['page'];
    $lastChapterPage = $lastData[$name]['lastPage'];

    $nextPage += $offset;

    if($nextPage > $lastChapterPage) {
      $nextChapter += 1;
      $nextPage = 1;
    }
  }

  $result['chapter'] = $nextChapter;
  $result['page'] = $nextPage;

  return $result;
}

function saveJobDone($name,$chapter,$page,$lastPage) {
  $lastData = json_decode(@file_get_contents(LAST_FILE), true);

  $save = [];
  $save['chapter']  = $chapter;
  $save['page']   	= $page;
  $save['lastPage'] = intval($lastPage);

  $lastData[$name] = $save;

  file_put_contents(LAST_FILE, json_encode($lastData));
}


function grabImageUrl($html) {
  $image = subStringBetween($html,'id="img"','alt=');
  $image = substr($image, strpos($image, 'http://') );
  $image = substr($image, 0,strpos($image, '"') );
  return $image;
}

function downloadImageAndSave($url,$name,$chapter,$page,$lastPage) {
  if(strlen($page) === 1) {
    $page = '0'.$page;
  }
  $img = str_replace('-', '', $name)."-$chapter-$lastPage-$page.jpg";

  $file = @file_get_contents($url);
  if($file===FALSE || strlen($file) < 10) {
    return FALSE;
  } else {
  	if (!is_dir(MANGA_DIR)) {
  		mkdir(MANGA_DIR);
  	}
    $filename = MANGA_DIR . '/' . $img;
    file_put_contents($filename, @file_get_contents($url));

    // Check saved file is correct or not
    $checkFile  = @file_get_contents($filename);
    if(strlen($checkFile) > 0) {
      return $img;
    } else {
      return FALSE;
    }
  }
}

function subStringBetween($string, $begin, $end) {
  if($begin === 0)
    return substr( $string, 0, strpos($string,$end) );
  if($end === 0)
    return substr($string, strpos($string, $begin)+strlen($begin));

  $string = ' '.$string;
  $ini = strpos($string,$begin);
  if ($ini == 0) return '';
  $ini += strlen($begin);
  $len = strpos($string,$end,$ini) - $ini;
  return substr($string,$ini,$len);
}