如何在HTML中创建表单注册限制？

Question

我正在尝试修复一个最近负责的网站。该网站包括用于不同类型培训的注册页面。我的主管希望我为每种事件创建注册限制。我以为我的代码看起来还不错，但是我无法使其正常工作。而不限制注册者的数量，它允许无限数量的人进行注册。

{

        $sql = "select * from $usertable where eventid=" .$eventid;

        $result = mysql_query($sql);

        $numrows= mysql_num_rows($result);

        if (($numrows >= 33 && ($typeevent == "asist")) || ($numrows >= 26 && ($typeevent == "hope")) || ($numrows >= 53 && ($typeevent == "rrsr"))   // check to see if maximum enrollment has been reached

            { ?>

                <form action="training-csp.php" method="get" name="regform2" id="regform2">

                <span class="important">This conference is full.  <br />

                <br />

                </span>

        <span class="tablestyle"> <br />

                <input name="submit" type="submit" value="Done" /></span>

                <?php 

            } // end of enrollment check section