PHP 后台定时循环刷新某个页面

如果间隔时间过长的话  会出现apache自动停止的现象。出现的原因则是设置了

<IfModule mpm_winnt_module>

ThreadsPerChild 450

MaxConnectionsPerChild 3000

</IfModule>

错误日志报错

[mpm_winnt:notice] [pid 126236:tid 316] AH00362: Child: Waiting 270 more seconds for 3 worker threads to finish.

[mpm_winnt:notice] [pid 126236:tid 316] AH00362: Child: Waiting 240 more seconds for 3 worker threads to finish.

.......

[pid 126236:tid 316] AH00363: Child: Terminating 2 threads that failed to exit.

[pid 126236:tid 316] AH00364: Child: All worker threads have exited.

然后直接停止了进程 导致循环结束

//此文件保存在为 sleep.php//定义一个自动刷新的时间$time = 500;//定义一个每次请求的最大运行时间$time_limit = 200;ignore_user_abort(True);$rest_time=intval($_GET["time"]);//本PHP访问的URL$base_url='http://domain.com/sleep.php';//自动刷新的页面$get_url='http://www.baidu.com';if($rest_time==0)$rest_time=$time;//延长PHP脚本执行的时间set_time_limit(3601);//加载HttpClient类require_once 'HttpClient.php';//如果时间比较长 需要多次的请求 防止被意外关闭if($rest_time>$time_limit){    //延时    sleep($time_limit);    //请求本url    $rest_time=$rest_time-$time_limit;    HttpClient::quickGet($base_url.'?time='$rest_time);    exit();}else{    //延时    sleep($rest_time);    HttpClient::quickGet($get_url);    HttpClient::quickGet($base_url);}

初次写 欢迎指正