php exec command or similar to not wait for result

Question

I have a command I want to run  but I do not want PHP to sit and wait for the result    lt  php echo  Starting Script   exec  run baby run    echo  Thanks  Script is running in background     gt    Is it possible to have PHP not wait for the result   i e  just kick it off and move along to the next command   I cant find anything  and not sure its even possible   The best I could find was someone making a CRON job to start in a minute

User · Answer

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.

User · Answer

You can run the command in the background by adding a  amp  at the end of it as   exec  run baby run  amp       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  gt   dev null  amp

User · Answer

This uses wget to notify a URL of something without waiting    command    wget -qO- http   test com data data   exec  nohup      command      gt  gt   dev null 2 gt  amp 1  amp  echo       pid     This uses ls to update a log without waiting    command    ls -la  gt  content log   exec  nohup      command      gt  gt   dev null 2 gt  amp 1  amp  echo       pid

User · Answer

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          gt   dev null 2 gt  amp 1  amp       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  gt   dev null 2 gt  amp 1  amp

User · Answer

There are two possible ways to implement it  The easiest way is direct result to dev null  exec  run baby run  gt   dev null 2 gt  amp 1  amp       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

User · Answer

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

[php] php exec command (or similar) to not wait for result

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