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Symfony has even more debugging tools.

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The easiest way to get all of them is to find
your terminal and run: composer require debug --

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dev Find your browser, surf back to
symfony.sh and search for "debug".

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Ah, so the debug alias will actually
install a package called symfony/debug-pack.

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So... what's a pack?

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Click to look at the package details,
and then go to its GitHub repository.

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Whoa! It's just a single file: composer.json!

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Inside, it requires six other libraries!

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Sometimes, you're going to want to install
several packages at once related to one feature.

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To make that easy, Symfony
has a number of "packs",

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and their whole purpose is
give you one easy package

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that actually installs several other libraries.

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In this case, composer require debug will
install Monolog - a logging library -

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phpunit-bridge for testing and even the
profiler-pack that we already installed earlier.

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If you go back to the terminal...

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yep! It downloaded all those
libraries and configured a few recipes.

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And... check this out!

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Refresh! Hey!

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Our Twig dump() got prettier!

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The debug-pack integrated
everything together even better.

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Go back to your Twig template
and remove that dump.

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Then, open composer.json.

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We just installed two packs: the
debug-pack and the profiler-pack.

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And we now know that the debug-pack is
actually a collection of about 6 libraries.

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But, packs have a disadvantage...

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a "dark side".

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What if you wanted to control the
version of just one of these libraries?

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Or what if you wanted most of these libraries,

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but you didn't want, for
example, the phpunit-bridge.

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Well... right now, there's no way to do that:
all we have is this one debug-pack line.

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Don't worry brave space traveler!

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Just... unpack the pack!

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Yep, at your terminal, run: composer
unpack debug The unpack command comes

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from Symfony flex.

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And... interesting!

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All it says is "removing symfony/debug-pack".

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But if you look at your composer.json, ah!

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It did remove symfony/debug-pack, but it
replaced it with the 6 libraries from that pack!

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We can now control the versions or even remove
individual libraries if we don't want them.

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That is the power of packs!