在调用exec（）之后，如何强制PHP脚本继续使用脚本？

I'm using the exec function in PHP to run a command. The command I'm running can often take quite a bit of time and I don't have any need to read it's output. Is there a simple way of telling PHP not to wait for the exec command to finish before moving on with the rest of the script?

// nohup_test.php:

// a very long running process
$command = 'tail -f /dev/null';
exec("nohup $command >/dev/null 2>/dev/null &"); // here we go
printf('run command: %s'.PHP_EOL, $command);
echo 'Continuing to execute the rest of this script instructions'.PHP_EOL;

for ($x=1000000;$x-->0;) {
  for ($y=1000000;$y-->0;) {
    //this is so long, so I can do ps auwx | grep php while it's running and see whether $command run in separate process
  }
}

run nohup_test.php:

$ php nohup_test.php
run command: tail -f /dev/null
Continuing to execute the rest of this script instructions

Let's find out pids of our processes:

$ ps auwx | grep tail
nemoden   3397  0.0  0.0   3252   636 pts/8    S+   18:41   0:00 tail -f /dev/null
$ ps auwx | grep php
nemoden   3394 82.0  0.2  31208  6804 pts/8    R+   18:41   0:04 php nohup_test.php

as you can see, pid is different and my script is running without waiting for tail -f /dev/null.

Here is what I use (you can use exec or system instead of paasthru):

passthru("/path/to/program args >> /path/to/logfile 2>&1 &");