MultiConfig.php

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<?php
class MultiConfig implements Config {

    private $configs;

    public function __construct( array $configs ) {
        $this->configs = $configs;
    }

    public function get( $name ) {
        foreach ( $this->configs as $config ) {
            if ( $config->has( $name ) ) {
                return $config->get( $name );
            }
        }

        throw new ConfigException( __METHOD__ . ": undefined option: '$name'" );
    }

    public function has( $name ) {
        foreach ( $this->configs as $config ) {
            if ( $config->has( $name ) ) {
                return true;
            }
        }

        return false;
    }
}