clearInterwikiCache.php

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

class ClearInterwikiCache extends Maintenance {

    public function __construct() {
        parent::__construct();
        $this->mDescription = "Clear all interwiki links for all languages from the cache";
    }

    public function execute() {
        global $wgLocalDatabases, $wgMemc;
        $dbr = wfGetDB( DB_SLAVE );
        $res = $dbr->select( 'interwiki', array( 'iw_prefix' ), false );
        $prefixes = array();
        foreach ( $res as $row ) {
            $prefixes[] = $row->iw_prefix;
        }

        foreach ( $wgLocalDatabases as $db ) {
            $this->output( "$db..." );
            foreach ( $prefixes as $prefix ) {
                $wgMemc->delete( "$db:interwiki:$prefix" );
            }
            $this->output( "done\n" );
        }
    }
}

$maintClass = "ClearInterwikiCache";
require_once RUN_MAINTENANCE_IF_MAIN;