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, 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 end of that string.

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

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

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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