Php exec 命令(或类似命令)来不等待结果

我有一个命令，我想运行，但我不希望 PHP 坐等结果。

<?php
echo "Starting Script";
exec('run_baby_run');
echo "Thanks, Script is running in background";
?>

Is it possible to have PHP not wait for the result.. i.e. just kick it off and move along to the next command.

我找不到任何东西，甚至不确定这是否可能。我能找到的最好的就是有人在一分钟内开始一个 CRON 工作。

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小开

You can run the command in the background by adding a & at the end of it as:

exec('run_baby_run &');

But doing this alone will hang your script because:

If a program is started with exec 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.

So you can redirect the stdout of the command to a file, if you want to see it later or to /dev/null if you want to discard it as:

exec('run_baby_run > /dev/null &');
小开

From the documentation:

In order to execute a command and have it not hang your PHP script while
it runs, the program you run must not output back to PHP. To do this,
redirect both stdout and stderr to /dev/null, then background it.

> /dev/null 2>&1 &

In order to execute a command and have
it spawned off as another process that
is not dependent on the Apache thread
to keep running (will not die if
somebody cancels the page) run this:

exec('bash -c "exec nohup setsid your_command > /dev/null 2>&1 &"');

小开

"exec nohup setsid your_command"

the nohup allows your_command to continue even though the process that launched may terminate first. If it does, the the SIGNUP signal will be sent to your_command causing it to terminate (unless it catches that signal and ignores it).

小开

This uses wget to notify a URL of something without waiting.

$command = 'wget -qO- http://test.com/data=data';
exec('nohup ' . $command . ' >> /dev/null 2>&1 & echo $!', $pid);

This uses ls to update a log without waiting.

$command = 'ls -la > content.log';
exec('nohup ' . $command . ' >> /dev/null 2>&1 & echo $!', $pid);
小开

There are two possible ways to implement it. The easiest way is direct result to dev/null

exec("run_baby_run > /dev/null 2>&1 &");

But in case you have any other operations to be performed you may consider ignore_user_abort In this case the script will be running even after you close connection.

小开

I know this question has been answered but the answers i found here didn't work for my scenario ( or for Windows ).

I am using windows 10 laptop with PHP 7.2 in Xampp v3.2.4.

$command = 'php Cron.php send_email "'. $id .'"';
if ( substr(php_uname(), 0, 7) == "Windows" )
{
//windows
pclose(popen("start /B " . $command . " 1> temp/update_log 2>&1 &", "r"));
}
else
{
//linux
shell_exec( $command . " > /dev/null 2>&1 &" );
}

This worked perfectly for me.

I hope it will help someone with windows. Cheers.

小开

On Windows, you may use the COM object:

if(class_exists('COM')) {
$shell = new COM('WScript.Shell');
$shell->Run($cmd, 1, false);
}
else {
exec('nohup ' . $cmd . ' 2>&1 &');
}

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