如何根据外部循环从内部循环中获取数据（表）？

Question

我有两张名为 tbl_collectiondesireddatetimelocations 和 tbl_locations

的表格

tbl_collectiondesireddatetimelocations 的结构是：

pk_collectiondesireddatetimelocationid
, fk_tbl_locations_locationid, fromdate, todate, fromtime, totime 

tbl_locations 的结构是

pk_locationid, name

我有以下页面：

在第一列中，从tbl_locations表填充位置。

我想要的是填写所请求列的数据？将从tbl_collectiondesireddatetimelocations中检索数据。对于例如班加罗尔的位置ID是1.我将检查tbl_collectiondesireddatetimelocations fk_tbl_locations_locationid列中是否存在位置ID 1。如果它存在，它将检索fromdate，todate，fromtime，totime列值并填充该特定位置的数据。

我写了以下代码：

<table style="width:100%;margin:0px;" class="maintable">
<tr><td colspan="1"></td><td colspan="4">
<font style="font-weight:bold;">Requested</font></td>
<td colspan="4"><font style="font-weight:bold;">Assigned</font></td>
</tr><tr>
<td>Location</td>
<td>From Date</td>
<td>To Date</td>
<td>From Time</td>
<td>To Time</td>
<td>From Date/td>
<td>To Date</td>
<td>From Time</td>
<td>To Time</td></tr>

<?php
foreach($locations as $location)
{
  foreach($desireddatetimelocations as $desireddatetimelocation)
  {
    if($desireddatetimelocation['fk_tbl_locations_locationid']== 
      $location['pk_locationid'])   
    {
      $fromdate=$desireddatetimelocation['fromdate'];
      $todate=$desireddatetimelocation['todate'];
      $fromtime=$desireddatetimelocation['fromtime'];
      $totime=$desireddatetimelocation['totime'];
    }
  }
?>
<tr><td><?php echo $location['name'];?></td>
<td><input type="text" name="txtFromDate_
<?php echo $location['pk_locationid'];?>" class="field" style="width:80px;"
readonly=""  value="<?php echo $fromdate;?>"/></td>
<td><input type="text" name="txtToDate_
<?php echo $location['pk_locationid'];?>"  
class="field" style="width:80px;" readonly="" value="<?php echo $todate;?>"/></td>
<td><input type="text" name="txtFromTime_
<?php echo $location['pk_locationid'];?>"  
class="field" style="width:80px;"  readonly="" value="<?php echo $fromtime;?>"/></td>
<td><input type="text" name="txtToTime_
<?php echo $location['pk_locationid'];?>"  
class="field" style="width:80px;" readonly="" value="<?php echo $totime;?>"/></td>
<td><input type="text" name="txtAssignedFromDate_
<?php echo $location['pk_locationid'];?>" 
class="date-pick field" style="width:80px;"/></td>
<td><input type="text" name="txtAssignedToDate_
<?php echo $location['pk_locationid'];?>"  
class="date-pick field" style="width:80px;"/></td>
<td><input type="text" name="txtAssignedFromTime_
<?php echo $location['pk_locationid'];?>"  
class="time-pick field" style="width:80px;" /></td>
<td><input type="text" name="txtAssignedToTime_
<?php echo $location['pk_locationid'];?>"  
class="time-pick field" style="width:80px;"/></td></tr>

<?php
}
?>
</table>

理想情况下，应为班加罗尔和chennai位置显示数据，因为表tbl_collectiondesireddatetimelocations包含这些位置的数据。但是我得到了错误的结果：其他地方也重复了数据

输出错误：

我很困惑我错了？

Answer 1

问题是，变量$ fromdate，$ todate，aso。即使找不到位置，仍然会在第二次运行中设置。

作为快速修复，您可以在内循环之前重置它们：

foreach($locations as $location)
{
  $fromdate='';
  $todate='';
  $fromtime='';
  $totime='';

  foreach($desireddatetimelocations as $desireddatetimelocation)
  {

另一种方法是创建location =＆gt;日期/时间映射的关联数组，并在循环中使用它：

<?php
$dateTimes = array();
foreach($desireddatetimelocations as $desireddatetimelocation)
{
    $dateTimes[$desireddatetimelocation['fk_tbl_locations_locationid']] = 
      $desireddatetimelocation;
}

foreach($locations as $location)
{
?>
<tr>
  <td><?php echo $location['name'];?></td>
  <td>
    <input type="text" name="txtFromDate_<?php echo $location['pk_locationid'];?>" 
      class="field" style="width:80px;" readonly="" 
      value="<?php echo isset($dateTimes[$location['pk_locationid']]) ? 
                          $dateTimes[$location['pk_locationid']]['fromdate'] : '';?>"/>
  </td>
.....