The OptionsResolver component is array_replace() on steroids. It allows you to create an options system with required options, defaults, validation (type, value), normalization and more.
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nicolas-grekas Merge branch '4.1'
* 4.1:
  [Form] Hardened test suite for empty data
  Bump phpunit XSD version to 5.2
  [Fwb][EventDispatcher][HttpKernel] Fix getClosureScopeClass usage to describe callables
  Add required key attribute
Latest commit a9c38e8 Nov 11, 2018

README.md