ini_set('user_agent','Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; GreenBrowser)');ini_set('max_execution_time', '0');$base = 'https://www.qu.la/book/19434/';$start = '7504808.html';$content_grep = '/    (.*)<br//>/';//$content_grep = '/<div id="content">(.*)<br//>/sS';$next_grep = '/<a id="pager_next" href=/"(/d+/.html)/" target="_top" class="next">下一章<//a>/';$next = $start;$file_name = '聽書了.txt';while($next) {  echo 'getting ' . $next . PHP_EOL;  $result = file_get_contents($base . $next);  preg_match_all($content_grep, $result, $match);  $isTitle = true;  $content = "";  foreach($match[1] as $line) {    $line  = str_replace("<br/>", '', $line);    $line  = str_replace(" ", '', $line);    if($isTitle) {      $content = $line . PHP_EOL . PHP_EOL;      $isTitle = false;    } else {      $content .= '    ' . $line . PHP_EOL . PHP_EOL;    }  }  $file = fopen($file_name, 'a');  echo 'write length: ' . strlen($content) . PHP_EOL;  fwrite($file, $content);  fclose($file);  echo '.';  preg_match($next_grep, $result, $match);  $next = $match[1];}