Php 从数据数组创建Optgroup

我正在使用Codeigniter查询我的数据库并返回一个数据数组

我得到了如下一系列数据：

Array
(
[0] => stdClass Object
    (
        [depot_id] => 1
        [depot_name] => Stockton On Tees
        [depot_description] => Arriva Stockton on Tees Depot
        [depot_postcode] => TS18 3AW
        [depot_lat] => 
        [depot_long] => 
        [operating_company_id] => 1
        [date_created] => 2014-02-14 10:24:17
        [date_edited] => 
        [edited_by] => 
        [status] => active
        [operating_company_name] => Arriva North East
        [operating_company_description] => Arriva North East
        [operating_company_lat] => 
        [operating_company_long] => 
        [operating_company_postcode] => 
        [operating_group_id] => 1
    )

[1] => stdClass Object
    (
        [depot_id] => 2
        [depot_name] => Darlington
        [depot_description] => Arriva Darlington Depot
        [depot_postcode] => DH1 1TW
        [depot_lat] => 
        [depot_long] => 
        [operating_company_id] => 1
        [date_created] => 2014-02-14 10:24:17
        [date_edited] => 
        [edited_by] => 
        [status] => active
        [operating_company_name] => Arriva North East
        [operating_company_description] => Arriva North East
        [operating_company_lat] => 
        [operating_company_long] => 
        [operating_company_postcode] => 
        [operating_group_id] => 1
    )

[2] => stdClass Object
    (
        [depot_id] => 3
        [depot_name] => Ashington
        [depot_description] => Arriva Ashington Depot
        [depot_postcode] => NE63 9UN
        [depot_lat] => 
        [depot_long] => 
        [operating_company_id] => 2
        [date_created] => 2014-02-14 10:46:05
        [date_edited] => 
        [edited_by] => 
        [status] => active
        [operating_company_name] => Arriva Northumbria
        [operating_company_description] => Arriva Northumbria
        [operating_company_lat] => 
        [operating_company_long] => 
        [operating_company_postcode] => 
        [operating_group_id] => 1
    )

[3] => stdClass Object
    (
        [depot_id] => 4
        [depot_name] => Blyth
        [depot_description] => Arriva Blyth Depot
        [depot_postcode] => NE24 2AP
        [depot_lat] => 
        [depot_long] => 
        [operating_company_id] => 2
        [date_created] => 2014-02-14 10:46:05
        [date_edited] => 
        [edited_by] => 
        [status] => active
        [operating_company_name] => Arriva Northumbria
        [operating_company_description] => Arriva Northumbria
        [operating_company_lat] => 
        [operating_company_long] => 
        [operating_company_postcode] => 
        [operating_group_id] => 1
    )

我想基于“运营公司名称”创建一个optgroup，因此在本例中，有两个仓库位于它下面

在我看来，我目前只是使用foreach循环来创建下拉列表

            <select name="depot_id" class="form-control">
            <?php foreach($depots as $depot): ?>
                    <optgroup label="<?php echo $depot->operating_company_name; ?>">
                        <option value="<?php echo $depot->depot_id; ?>"><?php echo $depot->depot_name; ?></option>
                    </optgroup>
            <?php endforeach; ?>
        </select>

请尝试，首先重新格式化源阵列，如下所示：

$result = array();
foreach($depots as $depot){
   $result[$depot->operating_company_name][] = $depot;
}

然后，对于创建选择try

<select name="depot_id" class="form-control">
            <?php foreach($result as $key=>$val): ?>
                    <optgroup label="<?php echo $key; ?>">
                       <?php foreach($val as $option): ?>
                        <option value="<?php echo $option->depot_id; ?>"><?php echo $option->depot_name; ?></option>
                         <?php endforeach; ?>
                    </optgroup>
            <?php endforeach; ?>
        </select>


请尝试，首先重新格式化源阵列，如下所示：

$result = array();
foreach($depots as $depot){
   $result[$depot->operating_company_name][] = $depot;
}

然后，对于创建选择try

<select name="depot_id" class="form-control">
            <?php foreach($result as $key=>$val): ?>
                    <optgroup label="<?php echo $key; ?>">
                       <?php foreach($val as $option): ?>
                        <option value="<?php echo $option->depot_id; ?>"><?php echo $option->depot_name; ?></option>
                         <?php endforeach; ?>
                    </optgroup>
            <?php endforeach; ?>
        </select>


我想你必须使用double foreach循环来创建你想要的东西试试这个：Hi@Newbi3我在做什么double looping？在解决了这个问题之后，你会遇到一些问题。您需要循环一次，才能将操作名称放入数组中。并使用名称作为键构建数组$optgroupArray[$depot->operating_company_name]对于每一场比赛，添加depot来制作一个2D数组。我想你必须使用double foreach循环来创建你想要的。试试这个：Hi@Newbi3我在做什么？在解决了你的一些问题之后。您需要循环一次，才能将操作名称放入数组中。并使用名称作为键构建数组$optgroupArray[$depot->operating_company_name]对于每一场比赛，添加仓库以形成2D阵列。绝对超赞！谢谢你的邀请，真是太棒了！谢谢你