UserArray.php

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<?php
abstract class UserArray implements Iterator {
        static function newFromResult( $res ) {
                $userArray = null;
                if ( !wfRunHooks( 'UserArrayFromResult', array( &$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(array());
                }
                $dbr = wfGetDB( DB_SLAVE );
                $res = $dbr->select( 'user', '*', array( 'user_id' => $ids ),
                        __METHOD__ );
                return self::newFromResult( $res );
        }

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

class UserArrayFromResult extends UserArray {

        var $res;
        var $key, $current;

        function __construct( $res ) {
                $this->res = $res;
                $this->key = 0;
                $this->setCurrent( $this->res->current() );
        }

        protected function setCurrent( $row ) {
                if ( $row === false ) {
                        $this->current = false;
                } else {
                        $this->current = User::newFromRow( $row );
                }
        }

        public function count() {
                return $this->res->numRows();
        }

        function current() {
                return $this->current;
        }

        function key() {
                return $this->key;
        }

        function next() {
                $row = $this->res->next();
                $this->setCurrent( $row );
                $this->key++;
        }

        function rewind() {
                $this->res->rewind();
                $this->key = 0;
                $this->setCurrent( $this->res->current() );
        }

        function valid() {
                return $this->current !== false;
        }
}