UserArray.php

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<?php
abstract class UserArray implements Iterator {
    static function newFromResult( $res ) {
        $userArray = null;
        if ( !Hooks::run( 'UserArrayFromResult', [ &$userArray, $res ] ) ) {
            return null;
        }
        if ( $userArray === null ) {
            $userArray = self::newFromResult_internal( $res );
        }
        return $userArray;
    }

    static function newFromIDs( $ids ) {
        $ids = array_map( 'intval', (array)$ids ); // paranoia
        if ( !$ids ) {
            // Database::select() doesn't like empty arrays
            return new ArrayIterator( [] );
        }
        $dbr = wfGetDB( DB_REPLICA );
        $res = $dbr->select(
            'user',
            User::selectFields(),
            [ 'user_id' => array_unique( $ids ) ],
            __METHOD__
        );
        return self::newFromResult( $res );
    }

    static function newFromNames( $names ) {
        $names = array_map( 'strval', (array)$names ); // paranoia
        if ( !$names ) {
            // Database::select() doesn't like empty arrays
            return new ArrayIterator( [] );
        }
        $dbr = wfGetDB( DB_REPLICA );
        $res = $dbr->select(
            'user',
            User::selectFields(),
            [ 'user_name' => array_unique( $names ) ],
            __METHOD__
        );
        return self::newFromResult( $res );
    }

    protected static function newFromResult_internal( $res ) {
        return new UserArrayFromResult( $res );
    }
}