（转）如何监控脚本运行状态

原文地址：http://stackoverflow.com/questions/45953/php-execute-a-background-process#45966

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Assuming this is running on a Linux machine, I've always handled it like this:

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exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, $outputfile, $pidfile));

?This launches the command $cmd, redirects the command output to $outputfile, and writes the process id to $pidfile.

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That lets you easily monitor what the process is doing and if it's still running.

function isRunning($pid){    try{        $result = shell_exec(sprintf("ps %d", $pid));        if( count(preg_split("/\n/", $result)) > 2){            return true;        }    }catch(Exception $e){}    return false;}