GlobalVarConfig.php

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<?php
class GlobalVarConfig implements Config {
 
    private $prefix;
 
    public static function newInstance() {
        return new GlobalVarConfig();
    }
 
    public function __construct( $prefix = 'wg' ) {
        $this->prefix = $prefix;
    }
 
    public function get( $name ) {
        return $this->getWithPrefix( $this->prefix, $name );
    }
 
    public function set( $name, $value ) {
        $this->setWithPrefix( $this->prefix, $name, $value );
    }
 
    protected function getWithPrefix( $prefix, $name ) {
        $var = $prefix . $name;
        if ( !isset( $GLOBALS[ $var ] ) ) {
            throw new ConfigException( __METHOD__ . ": undefined variable: '$var'" );
        }
        return $GLOBALS[ $var ];
    }
 
    protected function setWithPrefix( $prefix, $name, $value ) {
        $GLOBALS[ $prefix . $name ] = $value;
    }
}