Asynchronous shell exec in PHP

I've got a PHP script that needs to invoke a shell script but doesn't care at all about the output. The shell script makes a number of SOAP calls and is slow to complete, so I don't want to slow down the PHP request while it waits for a reply. In fact, the PHP request should be able to exit without terminating the shell process.

I've looked into the various exec() , shell_exec() , pcntl_fork() , etc. functions, but none of them seem to offer exactly what I want. (Or, if they do, it's not clear to me how.) Any suggestions?

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If it "doesn't care about the output", couldn't the exec to the script be called with the & to background the process?

EDIT - incorporating what @AdamTheHut commented to this post, you can add this to a call to exec :

" > /dev/null 2>/dev/null &"

That will redirect both stdio (first > ) and stderr ( 2> ) to /dev/null and run in the background.

There are other ways to do the same thing, but this is the simplest to read.

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An alternative to the above double-redirect:

" &> /dev/null &"

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我在用这个，因为它是真正开始独立的进程。

<?php
    `echo "the command"|at now`;
?>

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On linux you can do the following:

$cmd = 'nohup nice -n 10 php -f php/file.php > log/file.log & printf "%u" $!';
$pid = shell_exec($cmd);

This will execute the command at the command prompty and then just return the PID, which you can check for > 0 to ensure it worked.

This question is similar: Does PHP have threading?

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