Process Helper

The Process Helper shows processes as they're running and reports useful information about process status.

To display process details, use the ProcessHelper and run your command with verbosity. For example, running the following code with a very verbose verbosity (e.g. -vv):

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use Symfony\Component\Process\ProcessBuilder;

$helper = $this->getHelper('process');
$process = ProcessBuilder::create(array('figlet', 'Symfony'))->getProcess();

$helper->run($output, $process);

will result in this output:

../../../_images/process-helper-verbose.png

It will result in more detailed output with debug verbosity (e.g. -vvv):

../../../_images/process-helper-debug.png

In case the process fails, debugging is easier:

../../../_images/process-helper-error-debug.png

Arguments

There are three ways to use the process helper:

  • Using a command line string:

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    // ...
    $helper->run($output, 'figlet Symfony');
    
  • An array of arguments:

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    // ...
    $helper->run($output, array('figlet', 'Symfony'));
    

    Note

    When running the helper against an array of arguments, be aware that these will be automatically escaped.

  • Passing a Process instance:

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    use Symfony\Component\Process\ProcessBuilder;
    
    // ...
    $process = ProcessBuilder::create(array('figlet', 'Symfony'))->getProcess();
    
    $helper->run($output, $process);
    

Customized Display

You can display a customized error message using the third argument of the run() method:

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$helper->run($output, $process, 'The process failed :(');

A custom process callback can be passed as the fourth argument. Refer to the Process Component for callback documentation:

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use Symfony\Component\Process\Process;

$helper->run($output, $process, 'The process failed :(', function ($type, $data) {
    if (Process::ERR === $type) {
        // ... do something with the stderr output
    } else {
        // ... do something with the stdout
    }
});

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