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我有一个来自 PDO Fetch_assoc 的 var_dumped 数组，例如：

array
  0 => 
    array
      'Client_Firstname' => string 'Sandrah' (length=...)
      'Client_Lastname' => string 'Lewis' (length=...)
      'Client_Email' => string 'san@lewis.com' (length=...)
      'Purchased_ItemId' => int '16' (length=...)
      'ItemName' => string 'MiniPad' (length=...)
      'ItemPrice' => string '500.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)
  1 => 
     array
      'Client_Firstname' => string 'Derick' (length=...)
      'Client_Lastname' => string 'Smith' (length=...)
      'Client_Email' => string 'der@smith.com' (length=...)
      'Purchased_ItemId' => int '10' (length=...)
      'ItemName' => string 'MegaPad' (length=...)
      'ItemPrice' => string '1500.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)
  2 => 
     array
      'Client_Firstname' => string 'Sandrah' (length=...)
      'Client_Lastname' => string 'Lewis' (length=...)
      'Client_Email' => string 'san@lewis.com' (length=...)
      'Purchased_ItemId' => int '18' (length=...)
      'ItemName' => string 'Xpower Speakers' (length=...)
      'ItemPrice' => string '300.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)
  3 => 
     array
      'Client_Firstname' => string 'Sandrah' (length=1)
      'Client_Lastname' => string 'Lewis' (length=7)
      'Client_Email' => string 'san@lewis.com' (length=7)
      'Purchased_ItemId' => int '7' (length=7)
      'ItemName' => string 'Lion Belt' (length=7)
      'ItemPrice' => string '800.00' (length=7)
      'ItemType' => string 'Fashion' (length=7)
      'date' => string '2013-12-12' (length=7)
  4 => 
    array
      'Client_Firstname' => string 'Sandrah' (length=1)
      'Client_Lastname' => string 'Lewis' (length=7)
      'Client_Email' => string 'san@lewis.com' (length=7)
      'Purchased_ItemId' => int '27' (length=7)
      'ItemName' => string 'FT Card Reader' (length=7)
      'ItemPrice' => string '20.00' (length=7)
      'ItemType' => string 'Hardware' (length=7)
      'date' => string '2013-12-12' (length=7)
  5 => 
     array
      'Client_Firstname' => string 'Jonathan' (length=1)
      'Client_Lastname' => string 'Homad' (length=7)
      'Client_Email' => string 'jon@homad.com' (length=7)
      'Purchased_ItemId' => int '20' (length=7)
      'ItemName' => string 'MiniPad' (length=7)
      'ItemPrice' => string '500.00' (length=7)
      'ItemType' => string 'Hardware' (length=7)
      'date' => string '2013-12-12' (length=7)

目的是，在输出中，每个客户的名字、姓氏和电子邮件应该只出现一次，然后是所有他/她的交易。

就像是：

array
  0 => 
    array
      'Client_Firstname' => string 'Sandrah' (length=...)
      'Client_Lastname' => string 'Lewis' (length=...)
      'Client_Email' => string 'san@lewis.com' (length=...)
      'Purchased_ItemId' => int '16' (length=...)
      'ItemName' => string 'MiniPad' (length=...)
      'ItemPrice' => string '500.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)
      'Purchased_ItemId' => int '18' (length=...)
      'ItemName' => string 'Xpower Speakers' (length=...)
      'ItemPrice' => string '300.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)
      'Purchased_ItemId' => int '7' (length=...)
      'ItemName' => string 'Lion Belt' (length=...)
      'ItemPrice' => string '800.00' (length=...)
      'ItemType' => string 'Fashion' (length=...)
      'date' => string '2013-12-12' (length=...)
      'Purchased_ItemId' => int '27' (length=...)
      'ItemName' => string 'FT Card Reader' (length=...)
      'ItemPrice' => string '20.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)

  1 => 

     array
      'Client_Firstname' => string 'Derick' (length=...)
      'Client_Lastname' => string 'Smith' (length=...)
      'Client_Email' => string 'der@smith.com' (length=...)
      'Purchased_ItemId' => int '10' (length=...)
      'ItemName' => string 'MegaPad' (length=...)
      'ItemPrice' => string '1500.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)

  2 => 

     array
      'Client_Firstname' => string 'Jonathan' (length=...)
      'Client_Lastname' => string 'Homad' (length=...)
      'Client_Email' => string 'jon@homad.com' (length=...)
      'Purchased_ItemId' => int '20' (length=...)
      'ItemName' => string 'MiniPad' (length=...)
      'ItemPrice' => string '500.00' (length=...)
      'ItemType' => string 'Hardware' (length=...)
      'date' => string '2013-12-12' (length=...)

根据我的说法，每个数组中唯一的唯一标识符是电子邮件地址。所以，我尝试使用 for 循环，foreach 循环尝试根据电子邮件地址对它们进行分组，由其他 SO 相关问题指导，但这还没有实现。

非常感谢任何帮助。

4

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