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[PHP]进程篇_PHP

Jun 01, 2016 pm 12:35 PM
grepperlimplementprogramprocess

最近写了一个 监控在线进程的程序.

目的是为了 能实时监控执行程序是否断线,并及时重启。

用PHP写的,不算难,还成,但对于自己来讲挺有成就感的。

程序部分略省。

#将perl进程指向到一个文本中。  $psfile
$command = "ps ax | grep perl | grep -v \"> $psfile\" >$psfile";
exec($command);

 $process_array = file($psfile);   #打开文本
 $sum_process = sizeof($process_array);  #文本的每一行作为数组元素,此sizeof 则是 取元素个,即行数。

for ($i=0 ; $i  {
  echo $process_array[$i]."\n";                                 #$process_array[$i]  为文本中i行的记录
  echo $province_id[$PID]."\n";  
   if(strstr($process_array[$i],$province_id[$PID]))    # 对比是否存在进程
   {
    echo "有进程\n";
    $thread=1;
    break;
   }
   
 }


$command = "perl ".$program." > ".$phppath.$name."abc.txt &";   #重起进程命令
 system($command);  #重起进程

 特别说明:

1. 命令 ps ax | grep perl | grep -v "> $psfile" >$psfile 

    很奇怪: ps ax|grep perl > abc.dat (命令正确) 在sh里执行 与 用PHP 执行 输出结果会不同,所以需要加入 一个 管道  | grep -v "> $psfile"  就可以。大致作用是-v 不匹配$psfile  而且其他的输出。 具体原因不明挺奇怪的。

2. system() 函数

    PHP的此函数有个毛病 ~ 是执行时,它必须把当前的进程程序执行完后才会跳出,继续循环下一个需要重启的程序,就是说 如果有多个进程需要重启的话,那么此函数只能是一直等待 当前的进程程序执行完,才能重启下一个。。。。。。。。。。。。(汗颜)

解决方案:  将命令 写成后由后台执行。  就是---》 多加一个  &  (别小看这个~ 可解决了大问题)

例 : perl abc.pl > abc.dat & 

OK~

大功告成! ~^-^~

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