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 phpfunction 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);}?>