max_items

type: integer default: 2500

This is the maximum number of items to dump. Setting this option to -1 disables the limit.

min_depth

type: integer default: 1

Configures the minimum tree depth until which all items are guaranteed to be cloned. After this depth is reached, only max_items items will be cloned. The default value is 1, which is consistent with older Symfony versions.

max_string_length

type: integer default: -1

This option configures the maximum string length before truncating the string. The default value (-1) means that strings are never truncated.

dump_destination

type: string default: null

Configures the output destination of the dumps.

By default, the dumps are shown in the toolbar. Since this is not always possible (e.g. when working on a JSON API), you can have an alternate output destination for dumps. Typically, you would set this to php://stderr:

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# config/packages/debug.yaml
debug:
   dump_destination: php://stderr

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<!-- config/packages/debug.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/debug"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:debug="http://symfony.com/schema/dic/debug"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/debug http://symfony.com/schema/dic/debug/debug-1.0.xsd">

    <debug:config dump-destination="php://stderr" />
</container>

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// config/packages/debug.php
$container->loadFromExtension('debug', [
   'dump_destination' => 'php://stderr',
]);

Configure it to "tcp://%env(VAR_DUMPER_SERVER)%" in order to use the ServerDumper feature.