PHP CLI: Process Running: Difference between revisions

{{Uc nav PHP CLI}}

'''''PHP CLI Check if a process (program) is running'''''

|-

|'''''Run.bat'''''||'''''test_1.php''''';

|

TITLE CLI TEST BAT

COLOR B0

echo.

pause

|

   print_r(win32_ps_list_procs());

exit(0); // Script ran OK

|}

'''''Note'':''' Above assumes you have installed the extension '''php_win32ps.dll''' as described on the [[PHP CLI: PHP INI#Extension download | previous page]].

=== Reduce output ===

Running the above example produces an overwhelming amount of data lets reduce this by displaying only '''pids''' and '''executable path-names''', edit test_1.php as follows:

//print_r(win32_ps_list_procs());

$pid = $processArray['pid'];

$exe = $processArray['exe'];

}

exit(0); // Script ran OK

This produces a list of all running processes similar to this small extract:

3240  C:\Program Files\Mozilla Firefox\firefox.exe

3660  C:\WINDOWS\System32\svchost.exe

2916  H:\z_test_42\UniServer\udrive\usr\local\php\php.exe

…… etc

'''''[[#top | Top]]'''''

=== Check a process is running ===

This script shows how to target a process by name (example targets '''cmd.exe''') and check if it is currently running, change '''test_1.php''' as follows:

$processName = 'cmd.exe';

@$processList = win32_ps_list_procs();

   $exe = $processArray['exe'];

   if (basename($processArray['exe']) == $processName){

     break;

   }

}

exit(0); // Script ran OK

Run the batch file (double click on Run.bat) output will be similar to this:

  Process cmd.exe is running

1896  C:\WINDOWS\system32\cmd.exe

The above can be converted into a function for general purpose however there is a small problem.

I purposefully masked an issue with the above script. Comment out the break line as shown.  

{|

|

$processName = 'cmd.exe';

@$processList = win32_ps_list_procs();

   $exe = $processArray['exe'];

   if (basename($processArray['exe']) == $processName){

//    break;

   }

}

exit(0); // Script ran OK

|

Run the batch file (double click on Run.bat) several times

  Process cmd.exe is running

3860  C:\WINDOWS\system32\cmd.exe

  Process cmd.exe is running

3788  C:\WINDOWS\system32\cmd.exe

|}

There are three command processes running each with an identical name, if you were to kill the process by name all three processes are killed. To kill a single process use its PID this is always unique.

=== Kill process by name ===

This script uses a function to kill a named process, edit test_1.php and run the script (Run.bat)

function kill_proc($processName){

         $pid = $processArray['pid'];

         if (basename($processArray['exe']) == $processName){           

         }

     }

}

exit(0); // Script ran OK

Well if you are running XP-Pro '''Run.bat''' will have been killed. However if you are running XP-Home the process is not killed with '''taskkill'''. To keep both XP-Pro and XP-Home happy change the script to:

function kill_proc($processName){

}

exit(0); // Script ran OK

There is no end of these examples where an XP-Pro user (designer) never seeing or considering this type of issue, anyway I think the above vindicates my '''general note''' in the opening statement.

|-

|'''''Run.bat'''''

|

TITLE CLI TEST BAT

COLOR B0

echo.

pause

|}

|-

|'''''test_1.php''''';

|

  exec($command,$dummy,$return);                  // 0=running 1=not-running  

  if($return == 0){                                // Check return value

  }

  else{

  }

exit(0); // Script ran OK

|}

{|

|-

|

  // command line to be run note c as second parameter kills

  // the above named process   

  exec($command);                  // runs command   

  exit(0);                          // Script ran OK

|

'''''Test'':'''

* Run Notepad