You are browsing the Symfony 4.0 documentation, which changes significantly from Symfony 3.x. If your app doesn't use Symfony 4.0 yet, browse the Symfony 3.4 documentation.
Learn about every configuration option available in Symfony applications and discover the power of customizing the framework the way you want.
Ever wondered what configuration options you have available to you in
config/packages/*.yamlfiles? In this section, all the available configuration is broken down by the key (e.g.
framework) that defines each possible section of your Symfony configuration.
Forms and Validation
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