HashConfig.php

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<?php
class HashConfig implements Config, MutableConfig {

    private $settings;

    public static function newInstance() {
        return new HashConfig;
    }

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

    public function get( $name ) {
        if ( !$this->has( $name ) ) {
            throw new ConfigException( __METHOD__ . ": undefined option: '$name'" );
        }

        return $this->settings[$name];
    }

    public function has( $name ) {
        return array_key_exists( $name, $this->settings );
    }

    public function set( $name, $value ) {
        $this->settings[$name] = $value;
    }
}