迭代PHP阵列和验证数据

Question

说明：

使用PHP，我有一个表格，允许用户创建传出订单。

用户能够选择他们想要在特定的盒子＃中发送给特定客户的库存物品。

我想为此表单添加验证，因为用户不应该能够为同一个框＃选择2个不同的客户。

例子：

Person A -> Item A -> Box 1 
Person A -> Item B -> Box 1 
Person B -> Item C -> Box 2 
Person B -> Item D -> Box 1 //!! <- This should not be possible because          
Person C -> Item E -> Box 3  //Person A is already using Box #1. 

当表单提交我创造一个这样的数组：

$data = (object) array 
    (
    array (
     "customer" => "Person A", 
     "item" => "Item A", 
     "box" => "Box 1" 
    ), 
    array (
     "customer" => "Person A", 
     "item" => "Item B", 
     "box" => "Box 1" 
    ), 
    array (
     "customer" => "Person B", 
     "item" => "Item C", 
     "box" => "Box 2" 
    ), 
    array (
     "customer" => "Person B", 
     "item" => "Item D", 
     "box" => "Box 1" 
    ), 
    array (
     "customer" => "Person C", 
     "item" => "Item E", 
     "box" => "Box 3" 
    ) 

); 

问：

如何去通过这个数组迭代验证每个人都有自己的Box＃？

这就是我想，但我卡住：

$temp_arr = (object) array(); 

foreach($data as $row){ 

    if(!property_exists($temp_arr, $row['customer'])){ 
     $temp_arr->$row['customer'] = array(); 
    }; 

    //Load the boxes into the correct customer array 
    if(in_array($row['box'], $temp_arr->$row['customer'])){ 
     //Duplicate 
    } else { 
     array_push($temp_arr->$row['customer'], $row['box']); 
    } 

} 

Answer 1

<?php 
    $used_boxes = array(); 
    $valid_data = array(); 
    foreach($data as $row){ 
     if(!in_array($used_boxes)){ 
      //Box not used 
      $valid_data[$row['customer']] = $row['box']; 
      $used_boxes[] = $row['box'] 
     }else{ 
      //Box already used 
     } 
    } 
    var_dump($valid_data);