Linux 使用php在后台执行shell脚本
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Executing a shell script in background with php
提问by Jed
I need to execute a shell script. The catch is I want to do this
我需要执行一个shell脚本。问题是我想做这个
$Command = "nohup cvlc input --sout '#transcode {vcodec=h264,acodec=mp3,samplerate=44100}:std{access=http,mux=ffmpeg{mux=flv},dst=0.0.0.0:8083/".output"}' &";
$str = shell_exec($Command);
I dont want it to wait till the command is finished, i want it to run in a background process. I do not want another php thread as it will timeout the command can take up to 3 hours to finish.
我不希望它等到命令完成，我希望它在后台进程中运行。我不想要另一个 php 线程，因为它会超时命令最多需要 3 小时才能完成。
采纳答案by Matthieu Napoli
$str = shell_exec($Command.' 2>&1 > out.log');
You need to redirect the output of the command.
您需要重定向命令的输出。
If a program is started with this function, in order for it to continue running in the background, the output of the program must be redirected to a file or another output stream. Failing to do so will cause PHP to hang until the execution of the program ends.
如果一个程序是用这个函数启动的，为了让它在后台继续运行，程序的输出必须重定向到一个文件或另一个输出流。如果不这样做，将导致 PHP 挂起，直到程序执行结束。
回答by Eduardo Russo
You can try running your command in background using a function like this one:
您可以尝试使用如下函数在后台运行您的命令：
function exec_bg($cmd) {
if (substr(php_uname(), 0, 7) == "Windows"){
pclose(popen("start /B ". $cmd, "r"));
}
else {
exec($cmd . " > /dev/null &");
}
}
This makes your shell command runs, but the php flow continues.
这将使您的 shell 命令运行，但 php 流程仍在继续。
