php判断linux下程序问题实例,php判断linux实例
本文实例讲述了php判断linux下程序问题。分享给大家供大家参考。具体如下:
有时候在服务器上面写一些脚本的时候,经常要放到crontab里面定时运行。时间长了就有一个问题,那就是程序重复运行消耗太多的资源,怎么处理呢?下面璞玉写了两种方法.
//第一种:用linux里面的正则匹配 function ifrun($clsname,$bf = 0) { //下面进行检测,如有一个进程正在运行,则不运行 $str=shell_exec("/bin/ps ax > /home/root/".$clsname."_run.txt"); $str=shell_exec("/bin/grep -c '".$clsname.".php' /home/root/".$clsname."_run.txt"); if($bf >0) { if($str >=$bf) { return 1; } else { return 0; } } else { if ($str>=2) { return 1; } else { return 0; } } } //调用: if (ifrun('pooy',5)) { die("pooy is running"); } //备注:pooy是程序pooy.php的名称! //第二种:把进程写到文件里面,然后用file函数去读取然后去匹配字符串 system('ps -ef |grep wget > /root/pooy.txt'); $arr=file('/root/pooy.txt'); $total=count($arr); for($i=0;$i<$total;$i++){ $count=array(); if(stristr($arr[$i],'www/pooy') !== FALSE) { //echo '"earth" not found in string'; $count[]='no'; break; } } if(count($count) >= 1 ) { echo "A same programs are running"; exit(); }else { echo "start__________________________________________________"; } //注:"www/pooy" 是程序里面包含的字符串! //现在php程序在linux运行是否通畅多了呢?
希望本文所述对大家的php程序设计有所帮助。

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