updateDoubleWidthSearch.php

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

class UpdateDoubleWidthSearch extends Maintenance {

        public function __construct() {
                parent::__construct();
                $this->mDescription = "Script to normalize double-byte latin UTF-8 characters";
                $this->addOption( 'q', 'quiet', false, true );
                $this->addOption( 'l', 'How long the searchindex and revision tables will be locked for', false, true );
        }

        public function getDbType() {
                return Maintenance::DB_ADMIN;
        }

        public function execute() {
                $maxLockTime = $this->getOption( 'l', 20 );

                $dbw = wfGetDB( DB_MASTER );
                if ( $dbw->getType() !== 'mysql' ) {
                        $this->error( "This change is only needed on MySQL, quitting.\n", true );
                }

                $res = $this->findRows( $dbw );
                $this->updateSearchIndex( $maxLockTime, array( $this, 'searchIndexUpdateCallback' ), $dbw, $res );

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

        public function searchIndexUpdateCallback( $dbw, $row ) {
                return $this->updateSearchIndexForPage( $dbw, $row->si_page );
        }

        private function findRows( $dbw ) {
                $searchindex = $dbw->tableName( 'searchindex' );
                $regexp = '[[:<:]]u8efbd([89][1-9a]|8[b-f]|90)[[:>:]]';
                $sql = "SELECT si_page FROM $searchindex
                                 WHERE ( si_text RLIKE '$regexp' )
                                        OR ( si_title RLIKE '$regexp' )";
                return $dbw->query( $sql, __METHOD__ );
        }
}

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