getSlaveServer.php

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

class GetSlaveServer extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addOption( "group", "Query group to check specifically" );
        $this->mDescription = "Report the hostname of a slave server";
    }

    public function execute() {
        global $wgAllDBsAreLocalhost;
        if ( $wgAllDBsAreLocalhost ) {
            $host = 'localhost';
        } elseif ( $this->hasOption( 'group' ) ) {
            $db = wfGetDB( DB_SLAVE, $this->getOption( 'group' ) );
            $host = $db->getServer();
        } else {
            $lb = wfGetLB();
            $i = $lb->getReaderIndex();
            $host = $lb->getServerName( $i );
        }
        $this->output( "$host\n" );
    }
}

$maintClass = "GetSlaveServer";
require_once RUN_MAINTENANCE_IF_MAIN;