PHP：我的按钮在foreach循环中无法正常工作

public static function find_all() {
    return self::find_by_sql("SELECT * FROM ".self::$table_name);
}

它在包含我的foreach循环的文件顶部被引用：

<?php require_once("../../includes/initialize.php"); ?>
<?php if (!$session->is_logged_in()) { redirect_to("login.php"); } ?>
<?php
    $parents = UserParent::find_all();
?>

这是foreach循环：

<?php foreach($parents as $parent): ?>
        <div class='popup-screen' id = "popup">
          <div class = "spacing">
            Do you want to delete this data?
          </div>
            <a href="list_users.php?parentNum=<?php echo $parent->parentNum; ?>"> <input type="button" value="YES" class = "popup-button"> </a>
            <input type="button" value="CANCEL" class = "popup-button" onClick = "hide();">
        </div> 
        <tr class = "tr-1">
          <td onClick = "document.location = 'viewParent.php?parentNum=<?php echo $parent->parentNum; ?>';"><img src="../<?php echo $parent->image_path(); ?>" width="100" height = "100" class = "profile-pic"/></td>
          <td onClick = "document.location = 'viewParent.php?parentNum=<?php echo $parent->parentNum; ?>';">Parent</td>
          <td onClick = "document.location = 'viewParent.php?parentNum=<?php echo $parent->parentNum; ?>';"><?php echo $parent->username; ?></td>
          <td onClick = "document.location = 'viewParent.php?parentNum=<?php echo $parent->parentNum; ?>';"><?php echo ucwords($parent->firstName); ?></td>
          <td onClick = "document.location = 'viewParent.php?parentNum=<?php echo $parent->parentNum; ?>';"><?php echo ucwords($parent->lastName); ?></td>
          <td onClick = "show();"><img src = "../stylesheets/images2/delete-icon.png" height="25" width="25" ></td>  
        </tr>
<?php endforeach; ?>

这是javascript代码：

function show() 
{
    document.getElementById("popup").style.display='block';
}

function hide(){
    document.getElementById("popup").style.display='none';
}

基本上,我的代码所做的是创建从foreach循环获取其数据的信息行.在每行的末尾是一个删除图标,如img标记所示.点击删除图标后,show()函数将运行(show()函数只显示弹出div,它是不可见的) – 确认用户是否想要删除他/她的数据.如果用户单击CANCEL,则窗口将关闭,如javascript代码所示.如果用户单击是,则支持转到链接：list_users.php？parentNum = parentNum; ？> ($parent-> parentNum的值对于每一行是不同的).但是,锚标记ALWAYS检索第一行的链接,无论它是第三行还是其他任何东西(顺便说一下,其他td标记上的链接都可以工作).现在,我的问题是,如何正确链接弹出窗口上每行的YES按钮？