TitleArray.php

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<?php
abstract class TitleArray implements Iterator {
    static function newFromResult( $res ) {
        $array = null;
        if ( !wfRunHooks( 'TitleArrayFromResult', array( &$array, $res ) ) ) {
            return null;
        }
        if ( $array === null ) {
            $array = self::newFromResult_internal( $res );
        }
        return $array;
    }

    protected static function newFromResult_internal( $res ) {
        $array = new TitleArrayFromResult( $res );
        return $array;
    }
}

class TitleArrayFromResult extends TitleArray {

    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 = Title::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;
    }
}