Formatter Helper

The Formatter helper provides functions to format the output with colors. You can do more advanced things with this helper than you can in How to Color and Style the Console Output.

The FormatterHelper is included in the default helper set and you can get it by calling getHelper():

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

The methods return a string, which you'll usually render to the console by passing it to the OutputInterface::writeln method.

Note

As an alternative, consider using the SymfonyStyle to display stylized blocks.

Print Messages in a Section

Symfony offers a defined style when printing a message that belongs to some "section". It prints the section in color and with brackets around it and the actual message to the right of this. Minus the color, it looks like this:

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        [SomeSection] Here is some message related to that section
    

To reproduce this style, you can use the formatSection() method:

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        $formattedLine = $formatter->formatSection(
    'SomeSection',
    'Here is some message related to that section'
);
$output->writeln($formattedLine);
    

Print Messages in a Block

Sometimes you want to be able to print a whole block of text with a background color. Symfony uses this when printing error messages.

If you print your error message on more than one line manually, you will notice that the background is only as long as each individual line. Use the formatBlock() to generate a block output:

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        $errorMessages = ['Error!', 'Something went wrong'];
$formattedBlock = $formatter->formatBlock($errorMessages, 'error');
$output->writeln($formattedBlock);
    

As you can see, passing an array of messages to the formatBlock() method creates the desired output. If you pass true as third parameter, the block will be formatted with more padding (one blank line above and below the messages and 2 spaces on the left and right).

The exact "style" you use in the block is up to you. In this case, you're using the pre-defined error style, but there are other styles (info, comment, question), or you can create your own. See How to Color and Style the Console Output.

Print Truncated Messages

Sometimes you want to print a message truncated to an explicit character length. This is possible with the truncate() method.

If you would like to truncate a very long message, for example, to 7 characters, you can write:

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        $message = "This is a very long message, which should be truncated";
$truncatedMessage = $formatter->truncate($message, 7);
$output->writeln($truncatedMessage);
    

And the output will be:

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        This is...
    

The message is truncated to the given length, then the suffix is appended to the end of that string.

Negative String Length

If the length is negative, the number of characters to truncate is counted from the end of the string:

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        $truncatedMessage = $formatter->truncate($message, -5);
    

This will result in:

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        This is a very long message, which should be trun...
    

Custom Suffix

By default, the ... suffix is used. If you wish to use a different suffix, pass it as the third argument to the method. The suffix is always appended, unless truncated length is longer than a message and a suffix length. If you don't want to use suffix at all, pass an empty string:

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        $truncatedMessage = $formatter->truncate($message, 7, '!!'); // result: This is!!
$truncatedMessage = $formatter->truncate($message, 7, '');   // result: This is

$truncatedMessage = $formatter->truncate('test', 10);
// result: test
// because length of the "test..." string is shorter than 10
    

Formatting Time

Sometimes you want to format seconds to time. This is possible with the formatTime() method. The first argument is the seconds to format and the second argument is the precision (default 1) of the result:

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        Helper::formatTime(42);        // 42 secs
Helper::formatTime(125);       // 2 mins
Helper::formatTime(125, 2);    // 2 mins, 5 secs
Helper::formatTime(172799, 4); // 1 day, 23 hrs, 59 mins, 59 secs
    

Formatting Memory

Sometimes you want to format memory to GiB, MiB, KiB and B. This is possible with the formatMemory() method. The only argument is the memory size to format:

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        Helper::formatMemory(512);                // 512 B
Helper::formatMemory(1024);               // 1 KiB
Helper::formatMemory(1024 * 1024);        // 1.0 MiB
Helper::formatMemory(1024 * 1024 * 1024); // 1 GiB
    

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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