migrateUserGroup.php

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<?php
require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class MigrateUserGroup extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Re-assign users from an old group to a new one";
                $this->addArg( 'oldgroup', 'Old user group key', true );
                $this->addArg( 'newgroup', 'New user group key', true );
                $this->setBatchSize( 200 );
        }

        public function execute() {
                $count = 0;
                $oldGroup = $this->getArg( 0 );
                $newGroup = $this->getArg( 1 );
                $dbw = wfGetDB( DB_MASTER );
                $start = $dbw->selectField( 'user_groups', 'MIN(ug_user)',
                        array( 'ug_group' => $oldGroup ), __FUNCTION__ );
                $end = $dbw->selectField( 'user_groups', 'MAX(ug_user)',
                        array( 'ug_group' => $oldGroup ), __FUNCTION__ );
                if ( $start === null ) {
                        $this->error( "Nothing to do - no users in the '$oldGroup' group", true );
                }
                # Do remaining chunk
                $end += $this->mBatchSize - 1;
                $blockStart = $start;
                $blockEnd = $start + $this->mBatchSize - 1;
                // Migrate users over in batches...
                while ( $blockEnd <= $end ) {
                        $this->output( "Doing users $blockStart to $blockEnd\n" );
                        $dbw->begin();
                        $dbw->update( 'user_groups',
                                array( 'ug_group' => $newGroup ),
                                array( 'ug_group' => $oldGroup,
                                        "ug_user BETWEEN $blockStart AND $blockEnd" )
                        );
                        $count += $dbw->affectedRows();
                        $dbw->commit();
                        $blockStart += $this->mBatchSize;
                        $blockEnd += $this->mBatchSize;
                        wfWaitForSlaves();
                }
                $this->output( "Done! $count user(s) in group '$oldGroup' are now in '$newGroup' instead.\n" );
        }
}

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