php - 如何减少执行时间？

Question

我有一个 Facebook 应用程序，用户可以在其中对篮球比赛进行投注(猜猜获胜者、差异、mvp 和最佳得分手)。

我在一张 table 上放游戏，一张 table 上有用户的 ID，一张 table 上有赌注。

如果您猜对了获胜者，您将获得 1 分。如果您猜对了差异，您将获得 5 分。如果您猜对了 mvp，您将获得 3 分，最高得分手也是如此。

现在我有一个文件，其中包含所有用户及其积分:

        <table>
        <tr>
            <td></td>
            <td>
                Name
            </td>
            <td>
                Points
            </td>
        </tr>
        <?php
            $selectusers = $db->query("SELECT * FROM `predictorusers`");
            $c = 0;
            while ($appuser = $db->fetchRows($selectusers))
            {
                try
                {
                    $profile = $facebook->api('/'.$appuser['userid']);
                } catch (FacebookApiException $e) {
                    continue;
                }
                $c++;

                $points = 0;

                $selectbets = $db->query("SELECT * FROM `predictor` WHERE `userid`='{$profile['id']}'");
                while ($bet = $db->fetchRows($selectbets))
                {
                    $selectgame = $db->query("SELECT * FROM `schedule` WHERE `id`='{$bet['gameid']}'");
                    $game = $db->fetchRows($selectgame);

                    if ($bet['winner'] == 1 && $game['homescore'] > $game['awayscore'])
                    {
                        $points = $points + 1;

                        if (($game['homescore'] - $game['awayscore']) == $bet['diff'])
                            $points = $points + 5;
                    }
                    elseif ($bet['winner'] == 2 && $game['awayscore'] > $game['homescore'])
                    {
                        $points = $points + 1;

                        if (($game['awayscore'] - $game['homescore']) == $bet['diff'])
                            $points = $points + 5;
                    }

                    $selectmvprkg = $db->query("SELECT MAX(`rkg`) FROM `boxscore` WHERE `game`='{$game['id']}'");
                    $mvprgk = $db->fetchRows($selectmvprkg);

                    $selectmvp = $db->query("SELECT * FROM `boxscore` WHERE `rkg`='{$mvprkg['rkg']}'");
                    while ($mvp = $db->countRows($selectmvp))
                    {
                        if ($mvp['player'] == $bet['mvp'])
                            $points = $points + 3;
                    }

                    $selecttopscorerpts = $db->query("SELECT MAX(`pts`) FROM `boxscore` WHERE `game`='{$game['id']}'");
                    $topscorerpts = $db->fetchRows($selecttopscorerpts);

                    $selecttopscorer = $db->query("SELECT * FROM `boxscore` WHERE `pts`='{$topscorerpts['pts']}'");
                    while ($topscorer = $db->fetchRows($selecttopscorer))
                    {
                        if ($topscorer['player'] == $bet['topscorer'])
                            $points = $points + 5;
                    }
                }
        ?>
        <tr>
            <td>
                <?php echo $c; ?>
            </td>
            <td>
                <?php echo $profile['name']; ?>
            </td>
            <td>
                <?php echo $points; ?>
            </td>
        </tr>
        <?php
            }
        ?>
    </table>

唯一的问题是脚本需要超过 30 秒才能完全执行，因此服务器停止执行并发送错误:

Fatal error: Maximum execution time of 30 seconds exceeded in * on line 37

有谁知道如何防止这种情况发生吗？

编辑:

看看这个包含 0 个 API 调用的文件:

        <table>
        <tr>
            <td></td>
            <td>
                Name
            </td>
            <td>
                Points
            </td>
        </tr>
        <?php
            $selectusers = $db->query("SELECT * FROM `predictorusers`");
            $c = 0;
            while ($appuser = $db->fetchRows($selectusers))
            {
                $c++;

                $points = 0;

                $selectbets = $db->query("SELECT * FROM `predictor` WHERE `userid`='{$appuser['userid']}'");
                while ($bet = $db->fetchRows($selectbets))
                {
                    $selectgame = $db->query("SELECT * FROM `schedule` WHERE `id`='{$bet['gameid']}'");
                    $game = $db->fetchRows($selectgame);

                    if ($bet['winner'] == 1 && $game['homescore'] > $game['awayscore'])
                    {
                        $points = $points + 1;

                        if (($game['homescore'] - $game['awayscore']) == $bet['diff'])
                            $points = $points + 5;
                    }
                    elseif ($bet['winner'] == 2 && $game['awayscore'] > $game['homescore'])
                    {
                        $points = $points + 1;

                        if (($game['awayscore'] - $game['homescore']) == $bet['diff'])
                            $points = $points + 5;
                    }

                    $selectmvprkg = $db->query("SELECT MAX(`rkg`) FROM `boxscore` WHERE `game`='{$game['id']}'");
                    $mvprgk = $db->fetchRows($selectmvprkg);

                    $selectmvp = $db->query("SELECT * FROM `boxscore` WHERE `rkg`='{$mvprkg['rkg']}'");
                    while ($mvp = $db->countRows($selectmvp))
                    {
                        if ($mvp['player'] == $bet['mvp'])
                            $points = $points + 3;
                    }

                    $selecttopscorerpts = $db->query("SELECT MAX(`pts`) FROM `boxscore` WHERE `game`='{$game['id']}'");
                    $topscorerpts = $db->fetchRows($selecttopscorerpts);

                    $selecttopscorer = $db->query("SELECT * FROM `boxscore` WHERE `pts`='{$topscorerpts['pts']}'");
                    while ($topscorer = $db->fetchRows($selecttopscorer))
                    {
                        if ($topscorer['player'] == $bet['topscorer'])
                            $points = $points + 5;
                    }
                }
        ?>
        <tr>
            <td>
                <?php echo $c; ?>
            </td>
            <td>
                <?php echo $app['userid']; ?>
            </td>
            <td>
                <?php echo $points; ?>
            </td>
        </tr>
        <?php
            }
        ?>
    </table>

同样的事情也会发生。

Answer 1

我建议以某种方式缓存 API 调用的结果，这样您就不必在每次页面加载时为每个用户调用 API。

您可能还想查看Facebook API functions that allow you to request data for more than a single user at a time - 对结果集中的所有用户进行一次 API 调用比对每个用户进行单独的 API 调用要快得多。

此外，一般来说，在多个级别的循环中嵌套查询并不是一个好主意 - 尝试减少正在运行的查询总数。