php-symfony-options-resolver 2.7.1+dfsg-1 (amd64 binary) in ubuntu wily

 The Symfony OptionsResolver Component allows the configuration of objects
 with option arrays by supporting default values on different levels
 of class hierarchy, option constraints and lazy options whose default
 value depends on the value of another option.
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 Symfony is a PHP framework, a set of tools and a development methodology.