如何指向右鍵以從數組中獲取某些值？

我有如下所示的數組數據，如果我的貨幣是美元，我想將「銷售」值存儲到數據庫中。如何指向右鍵以從數組中獲取某些值？

 
Array ([currency] => USD [sale] => 9120.00 [buy] => 8970.00 ) 
Array ([currency] => SGD [sale] => 6653.75 [buy] => 6520.75 ) 
Array ([currency] => HKD [sale] => 1173.40 [buy] => 1152.10 ) 
Array ([currency] => CHF [sale] => 8685.40 [buy] => 8517.40 ) 
Array ([currency] => GBP [sale] => 13958.80 [buy] => 13675.80 ) 
Array ([currency] => AUD [sale] => 8054.05 [buy] => 7885.05 ) 
Array ([currency] => JPY [sale] => 105.10 [buy] => 102.40 ) 
Array ([currency] => SEK [sale] => 1247.90 [buy] => 1216.80 ) 
Array ([currency] => DKK [sale] => 1590.95 [buy] => 1547.75 ) 
Array ([currency] => CAD [sale] => 8756.35 [buy] => 8568.35 ) 
Array ([currency] => EUR [sale] => 11776.75 [buy] => 11555.75 ) 
Array ([currency] => SAR [sale] => 2441.35 [buy] => 2382.35 ) 
Array ([currency] => NZD [sale] => 6550.75 [buy] => 6389.75 ) 
Array ([currency] => CNY [sale] => 1346.75 [buy] => 1322.35 )

謝謝。

這裏我的代碼：

foreach ($cur_array as $curs) { 
    print_r ($curs)."<br>"; 
    if ($curs['currency'] = "USD") { 
     $curs_sale = $curs['sale']; 
      $curs_name = $curs['currency']; 
      $db->query("UPDATE currency SET rate = '". 
       $curs_sale."' WHERE currency_id ='".$curs_name."'"); 
    } 
}

來源

2010-07-21 Chandra

你的表列別不符合你的變量。有點混淆那裏... – BoltClock 2010-07-21 05:42:54

您可以將所有的貨幣數組只是存儲在陣列中，環路通過它，檢查哪些貨幣對應於美元並保存該幣種的銷售價值：

foreach ($currencies as $curr) 
{ 
    if ($curr['currency'] == 'USD') 
    { 
     // Save $curr['sale'] into your database 

     // Break as further iteration isn't needed 
     break; 
    } 
}

在futu如果您不知道what community wiki means，請不要將問題標記爲社區wiki。

來源

2010-07-21 05:22:59 BoltClock

我做了同樣的，但我得到錯誤的價值。 – Chandra 2010-07-21 05:36:18

你的意思是錯誤的價值是什麼？ – BoltClock 2010-07-21 05:40:11

關於社區維基，我真的很抱歉。存儲值是$ cur_sale的最後一個值。當我添加break語句時，我可以存儲正確的值。但是，如果我想存儲貨幣名稱和銷售價值。謝謝。 – Chandra 2010-07-21 05:48:57

假設所有的項目都在一個數組名爲$項：

foreach ($entries as $entry) { 
    if ($entry['currency'] == 'USD') { 
     // do stuff with $entry['sale'] 
    } 
}

來源

2010-07-21 05:22:05 Cowlby

BoltClock提出的是正確的。此外，考慮改變你的陣列的結構：

 
Array ([currency] => USD [sale] => 9120.00 [buy] => 8970.00 ) 
Array ([currency] => SGD [sale] => 6653.75 [buy] => 6520.75 ) 
Array ([currency] => HKD [sale] => 1173.40 [buy] => 1152.10 ) 
Array ([currency] => CHF [sale] => 8685.40 [buy] => 8517.40 )

到：

 
Array (
    [USD] => Array([sale] => 9120.00 [buy] => 8970.00), 
    [SGD] => Array([sale] => 6653.75 [buy] => 6520.75), 
    [HKD] => Array([sale] => 1173.40 [buy] => 1152.10), 
    [CHF] => Array([sale] => 8685.40 [buy] => 8517.40) 
)

這種結構將允許您編寫更乾淨的代碼，例如：

$usd_sale = $entries['USD']['sale'];

來源

2010-07-21 05:33:38 Anax

使用貨幣名稱作爲鍵的+1更具語義。 – BoltClock 2010-07-21 05:45:22

但它可能沒有充分映射到數據的關鍵字 - 這看起來可能是一個訂單或產品表，在這種情況下，貨幣不是該條目的正確關鍵。你能想象在貨幣數據庫中將貨幣作爲類似實體表的主鍵嗎？ – Shabbyrobe 2010-07-21 05:54:15

@Shabbyrobe：table貨幣（int id，varchar name，float sale，float buy），代碼：'while（$ line = mysql_fetch_array（$ result））$ entries [$ line ['name']] = array（'sale '=> $ line ['sale']，'buy'=> $ line ['buy']）;' – Anax 2010-07-21 06:15:19

如何指向右鍵以從數組中獲取某些值？

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