getConfiguration.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class GetConfiguration extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Get serialized MediaWiki site configuration";
                $this->addOption( 'settings', 'Space-separated list of wg* variables', true, true );
                $this->addOption( 'format', 'PHP or JSON', true, true );
                $this->addOption( 'wiki', 'Wiki ID', true, true );
        }

        public function execute() {
                $res = array();
                foreach ( explode( ' ', $this->getOption( 'settings' ) ) as $name ) {
                        if ( !preg_match( '/^wg[A-Z]/', $name ) ) {
                                throw new MWException( "Variable '$name' does start with 'wg'." );
                        } elseif ( !isset( $GLOBALS[$name] ) ) {
                                throw new MWException( "Variable '$name' is not set." );
                        } elseif ( !$this->isAllowedVariable( $GLOBALS[$name] ) ) {
                                throw new MWException( "Variable '$name' includes non-array, non-scalar, items." );
                        }
                        $res[$name] = $GLOBALS[$name];
                }

                $out = null;
                switch( $this->getOption( 'format' ) ) {
                        case 'PHP':
                                $out = serialize( $res );
                                break;
                        case 'JSON':
                                $out = FormatJson::encode( $res );
                                break;
                        default:
                                throw new MWException( "Invalid serialization format given." );
                }
                if ( !is_string( $out ) ) {
                        throw new MWException( "Failed to serialize the requested settings." );
                }

                $this->output( $out . "\n" );
        }

        private function isAllowedVariable( $value ) {
                if ( is_array( $value ) ) {
                        foreach ( $value as $k => $v ) {
                                if ( !$this->isAllowedVariable( $v ) ) {
                                        return false;
                                }
                        }
                        return true;
                } elseif ( is_scalar( $value ) ) {
                        return true;
                }
                return false;
        }
}

$maintClass = "GetConfiguration";
require_once( RUN_MAINTENANCE_IF_MAIN );