Php exec() background process issues

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8 Answers

background
90%

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.,> /dev/null 2>&1 & redirects stdout and stderr to /dev/null and puts long_running_process into the background.,> /dev/null 2>&1 & redirects stdout and stderr to /dev/null and puts long_running_process into the background. , Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers

so:

exec("php csv.php $file $user > /dev/null &"); // no $output
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I'm trying to process a file in the background with the following command, but it does nothing.,If I remove > /dev/null & then the file processes, but not in the background.,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.,Have you considered using screen? You can start up a screen session that runs in a detached process. Output will go to the screen session, which you can reattach to in another terminal while it is still running.

I'm trying to process a file in the background with the following command, but it does nothing.

exec("php csv.php $file $user > /dev/null &", $output);

If I remove > /dev/null & then the file processes, but not in the background.

exec("php csv.php $file $user", $output);
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I'm trying to process a file in the background with the following command, but it does nothing.,If I remove > /dev/null & then the file processes, but not in the background.,Problem solved with the following command:,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.

I'm trying to process a file in the background with the following command, but it does nothing.

exec("php csv.php $file $user > /dev/null &", $output);

If I remove > /dev/null & then the file processes, but not in the background.

exec("php csv.php $file $user", $output);
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Example #1 An exec() example, If the result_code argument is present along with the output argument, then the return status of the executed command will be written to this variable. ,On Windows exec() will first start cmd.exe to launch the command. If you want to start an external program without starting cmd.exe use proc_open() with the bypass_shell option set.,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.

Returned with status 0 and output:
   Array(
      [0] => cmb
   )
75%

Is that making sense? Here is the trigger.php file that runs the exec() command,So for example I have trigger.php that runs the exec function that calls for my backgroundProcess.php to be parsed and executed.,However the problem is that my trigger.php file is waiting for the exec() command to finish running backgroundProcess.php before it stops. The background process runs for about 20-30 seconds, and trigger.php is waiting all that time until backgroundProcess.php has fully finished.,Problem solved with the following command:

Is that making sense? Here is the trigger.php file that runs the exec() command

exec('C:\wamp\bin\php\php'.phpversion().
   '\php.exe -f C:\path\to\backgroundProcess.php > C:\wamp\bin\php\php'.phpversion().
   '\dev\null &');

Problem solved with the following command:

$WshShell = new COM("WScript.Shell");
$oExec = $WshShell - > Run("C:\wamp\bin\php\phpVERSIONNUMBER\php-win.exe -f C:/wamp/www/path/to/backgroundProcess.php", 0, false);
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While working in PHP project, sometimes we need to have such script that to much time in execution. Tasks like sending mails, big database process or file creation can be set to execute in background so the next process can be executed and don't need to wait for next process.,This will execute $cmd in the background without PHP waiting for it to finish, on both Windows and Linux.,In PHP there are many ways you can do this in background. There are plenty of packages available to do such task. But many of us want to do self for learning. There are also many ways we can do this with PHP also.,I'm impressed, I have to admit. Seldom do I come across a blog that's both educative and interesting, and without a doubt, you've hit the nail on the head.The problem is something too few people are speaking intelligently about.Now i'm very happy I found this during my search for something regarding this. https://uricasino114.com

Here are some ways that I have come to know to do this. The first way is to execute the command. In the Linux system it can be done with bellow code.

exec('/usr/bin/php path/to/script.php >/dev/null &');
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How to check the background process in Linux?,What do you do to keep job running in the background when process gets SIGHUP?,How to run a php script in background,step 3: create a instance of the class BackgroundProcess

The concept, In LINUX there is a shell script which is used to run the process in background. You can put a task (such as command or script) in a background by appending a & at the end of the command line. The & operator puts command in the background and free up your terminal. The command which runs in background is called a job. You can type other command while background command is running.

Syntax: {
      command
   } &

   Example: ls - l & exec php index.php > /dev/null
2 > & 1 & echo $
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Issues I faced while using it with codeigniter3.,How to use in CodeIgniter 3 Issues I faced while using it with codeigniter3. ,EXECUTE PHP SCRIPT IN BACKGROUND PROCESSING How to check the background process in Linux? ,The scenario, when we need to run some script without waiting for the fronted user till the process is not completed, For that we need to execute some script in the background to hide the execution time to the user.

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