如何离线执行php任务

<?php
//设置忽略是否关闭终端窗口
ignore_user_abort(true);
ini_set('max_execution_time', '0');
//采集页面函数，看不懂执行百度curl php
function getfiles($url,$name){
  $name = $name.".txt";
  $ch = curl_init("$url");
  $fp = fopen("$name", "w");
  curl_setopt($ch, CURLOPT_FILE, $fp);
  curl_setopt($ch, CURLOPT_HEADER, 0);
  curl_exec($ch);
  curl_close($ch);
  fclose($fp);
  sleep(5);
  echo '<script>window.close();</script>';
}
//配置需要采集的页面路径数组
$urls = array(
  'http://www.cnblogs.com/jianqingwang/p/6373168.html',
  'http://www.cnblogs.com/jianqingwang/p/6148644.html',
  'http://www.61916.com/news_view_2423.html',
  'http://blog.sina.com.cn/s/blog_8e326c350102w1ah.html',
  'http://www.w3school.com.cn/php/func_misc_ignore_user_abort.asp',
  'http://xinwen.eastday.com/a/170219205305597.html',
  'http://society.huanqiu.com/article/2017-02/10162630.html?from=bdwz',
  'http://www.cankaoxiaoxi.com/roll10/bd/20170220/1699670.shtml',
  'http://news.china.com/socialgd/10000169/20170220/30266284.html',
  'http://news.k618.cn/society/201702/t20170220_10368740.html',
  'http://fj.qq.com/a/20170218/029521.htm'
);
//遍历数组
foreach($urls as $key=>$val){
  getfiles($val,$key);
}
?>