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( $name ) {
        if ( !$this->has( $name ) ) {
            throw new ConfigException( __METHOD__ . ": undefined option: '$name'" );
        }
        return $this->getWithPrefix( $this->prefix, $name );
    }

    public function has( $name ) {
        return $this->hasWithPrefix( $this->prefix, $name );
    }

    public function set( $name, $value ) {
        wfDeprecated( __METHOD__, '1.24' );
        $this->setWithPrefix( $this->prefix, $name, $value );
    }

    protected function getWithPrefix( $prefix, $name ) {
        return $GLOBALS[$prefix . $name];
    }

    protected function hasWithPrefix( $prefix, $name ) {
        $var = $prefix . $name;
        return array_key_exists( $var, $GLOBALS );
    }

    protected function setWithPrefix( $prefix, $name, $value ) {
        $GLOBALS[$prefix . $name] = $value;
    }
}