The ArrayNodeDefinition class is a part of the Symfony\Component\Config\Definition\Builder namespace in PHP Symfony framework. It provides a convenient way to define the structure and configuration options for an array node in application configuration files. This class allows developers to specify the allowed child nodes, the expected types of values, and default values for the array node. It also provides methods to add validation rules and constraints for the array elements. ArrayNodeDefinition simplifies the configuration process by providing a fluent interface to create and define array nodes in the configuration tree.
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