多个复选框列更新多个SQL行

Question

在使用多列更新多行数据时，我从来没有遇到过编写PHP SQL更新的问题，但由于某些原因，这部分编码正在扼杀我，因为它只不过是最终用户检查的复选框和/或取消选中。我已经在下面添加了部分代码，因为完整代码的复选框超过50列以上，可以包含1-200行。

所有内容都以其应有的方式显示/运行，但更新无法正常运行...例如：如果有5行（每个都有一个唯一的trackingid），我在更新时检查第4行的复选框，它表示选中第一个复选框，而不是第四行。

<?php if (!isset($_POST['trackingid'])) { ?>
        
	<form action="<?php echo $_SERVER['REQUEST_URI']; ?>" method="post" enctype="multipart/form-data" class="form-horizontal" id="form"><input type="hidden" name="id" value="<?php echo $id; ?>">

        <table class="table table-striped">
            <thead>
                <tr>
                    <td class="rotate-alt"></td>
                    <td class="rotate-alt2"><div><span></span></div></td>
                    <td class="rotate-alt2"><div><span></span></div></td>
                    <td class="rotate-alt2"><div><span></span></div></td>
                    <td class="rotate-alt2"><div><span></span></div></td>
                    <td class="rotate-alt2"><div><span></span></div></td>
                    <td class="rotate-alt"><div><span>Glass</span></div></td>
                    <td class="rotate-alt"><div><span>Glass - SDL</span></div></td>
                    <td class="rotate-alt"><div><span>Mill - S&amp;R</span></div></td>
                </tr>
             </thead>
          <tbody>
            
            <?php $result = sqlsrv_query($conn, "SELECT id, [Order Number], [Door Number], [Qty Display], [Interior or Exterior], [Style], Species_DD_Desc, [Mill Batch Nbr],
        
            [Glass Completed], [Glass Completed By], [Glass STD Hrs], [SDL Completed], [SDL Completed By], [SDL STD Hrs],
            
            [Mill Completed], [Mill Completed By], [Mill STD Hrs]
            
            FROM PD_Tracking 
            
            WHERE [Order Number] = '$id'
            
            ORDER BY [Door Number], [Qty Display], [Mill Batch Nbr]");
            $i=0;
            while ($list = sqlsrv_fetch_array($result, SQLSRV_FETCH_ASSOC)){ ?>
            
            <tr>
                    <td class="center">
                        <input type="checkbox" onclick="$('input[id=\'selid<?php echo $i; ?>\']').attr('checked', this.checked);">
                        <input type="hidden" name="trackingid[]" value="<?php echo $list['id']; ?>">
                    </td>
                    <td class="center"><?php echo $list['Door Number']; ?></td>
                    <td class="center"><?php echo $list['Qty Display']; ?></td>
                    <td class="center"><?php echo $list['Interior or Exterior']; ?></td>
                    <td class="center"><?php echo $list['Style']; ?></td>
                    <td class="center"><?php echo $list['Species_DD_Desc']; ?></td>
                    <td class="center">
                        <?php if (($list['Glass STD Hrs']>0) && (!isset($list['Glass Completed']))){ ?> 
                            <input type="checkbox" name="glass[]" id="selid<?php echo $i; ?>">
                        <?php } else if (($list['Glass STD Hrs']>0) && ($list['Glass Completed'] > ' ')){ ?> 
                            <input type="checkbox" name="glass[]" checked="checked" id="selid<?php echo $i; ?>">
                        <?php } else { ?>
                            NR
                        <?php } ?>   
                    </td>
                    <td class="center">
                        <?php if (($list['SDL STD Hrs']>0) && (!isset($list['SDL Completed']))){ ?> 
                            <input type="checkbox" name="sdl[]" id="selid<?php echo $i; ?>">
                        <?php } else if (($list['SDL STD Hrs']>0) && ($list['SDL Completed'] > ' ')){ ?> 
                            <input type="checkbox" name="sdl[]" checked="checked" id="selid<?php echo $i; ?>">
                        <?php } else { ?>
                            NR
                        <?php } ?>   
                    </td>
                    <td class="center">
                        <?php if (($list['Mill STD Hrs']>0) && (!isset($list['Mill Completed']))){ ?> 
                            <input type="checkbox" name="mill[]" id="selid<?php echo $i; ?>">
                        <?php } else if (($list['Mill STD Hrs']>0) && ($list['Mill Completed'] > ' ')){ ?> 
                            <input type="checkbox" name="mill[]" checked="checked" id="selid<?php echo $i; ?>">
                        <?php } else { ?>
                            NR
                        <?php } ?>   
                    </td>
              </tr>
            <?php ++$i;
            } ?>
          </tbody>
       </table>
      <?php } // END if (!isset($_POST['trackingid'])) {

if (isset($_POST['trackingid'])) {
	
	$query = sqlsrv_query($conn, "SELECT * FROM users WHERE id=".$_SESSION['auid']."");
	$row = sqlsrv_fetch_array($query, SQLSRV_FETCH_ASSOC);
	$employee_num = $row['Employee Number'];
	
	$size = count($_POST['trackingid']);
	for($i=0; $i < $size; $i++){
		
		$trackingid = $_POST['trackingid'][$i];
        
        $query = "UPDATE PD_Tracking SET ";
		
		if(isset($_POST['glass'][$i])){
			$query .= "[Glass Completed]='$date_time_entered', [Glass Completed By]='$employee_num', ";
		} else {
			$query .= "[Glass Completed]= NULL, [Glass Completed By]= NULL, ";
		}
		
		if(isset($_POST['sdl'][$i])){
			$query .= "[SDL Completed]='$date_time_entered', [SDL Completed By]='$employee_num', ";
		} else {
			$query .= "[SDL Completed]= NULL, [SDL Completed By]= NULL, ";
		}
		
		if(isset($_POST['mill'][$i])){
			$query .= "[Mill Completed]='$date_time_entered', [Mill Completed By]='$employee_num' ";
		} else {
			$query .= "[Mill Completed]= NULL, [Mill Completed By]= NULL ";
		}

        $query .= "WHERE id='$trackingid'";

		$query = sqlsrv_query($conn, $query);

	} // END for($i=0; $i < $size; $i++){?>
    
    <SCRIPT LANGUAGE='JavaScript'>
	<!-- Begin 
		window.location = '<?php echo $_SERVER['REQUEST_URI']; ?>&success=edit'; 
	//  End -->
	</script>
		
	
<?php } // END if (isset($_POST['trackingid'])) { ?>