Progress Helper

When executing longer-running commands, it may be helpful to show progress information, which updates as your command runs:

To display progress details, use the ProgressHelper, pass it a total number of units, and advance the progress as your command executes:

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$progress = $this->getHelper('progress');

$progress->start($output, 50);
$i = 0;
while ($i++ < 50) {
    // ... do some work

    // advance the progress bar 1 unit
    $progress->advance();
}

$progress->finish();

If you want to output something while the progress bar is running, call clear() first. After you're done, call display() to show the progress bar again.

The appearance of the progress output can be customized as well, with a number of different levels of verbosity. Each of these displays different possible items - like percentage completion, a moving progress bar, or current/total information (e.g. 10/50):

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$progress->setFormat(ProgressHelper::FORMAT_QUIET);
$progress->setFormat(ProgressHelper::FORMAT_NORMAL);
$progress->setFormat(ProgressHelper::FORMAT_VERBOSE);
$progress->setFormat(ProgressHelper::FORMAT_QUIET_NOMAX);
// the default value
$progress->setFormat(ProgressHelper::FORMAT_NORMAL_NOMAX);
$progress->setFormat(ProgressHelper::FORMAT_VERBOSE_NOMAX);

You can also control the different characters and the width used for the progress bar:

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// the finished part of the bar
$progress->setBarCharacter('<comment>=</comment>');
// the unfinished part of the bar
$progress->setEmptyBarCharacter(' ');
$progress->setProgressCharacter('|');
$progress->setBarWidth(50);

To see other available options, check the API documentation for ProgressHelper.

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$progress->start($output, 50000);

// update every 100 iterations
$progress->setRedrawFrequency(100);

$i = 0;
while ($i++ < 50000) {
    // ... do some work

    $progress->advance();
}