clear_interwiki_cache.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 );