如何指向右键以从数组中获取某些值？

我有如下所示的数组数据，如果我的货币是美元，我想将“销售”值存储到数据库中。如何指向右键以从数组中获取某些值？

 
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 )

谢谢。

这里我的代码：

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."'"); 
    } 
}

来源

2010-07-21 Chandra

你的表列别不符合你的变量。有点混淆那里... – BoltClock 2010-07-21 05:42:54

您可以将所有的货币数组只是存储在阵列中，环路通过它，检查哪些货币对应于美元并保存该币种的销售价值：

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

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

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来源

2010-07-21 05:22:59 BoltClock

我做了同样的，但我得到错误的价值。 – Chandra 2010-07-21 05:36:18

你的意思是错误的价值是什么？ – BoltClock 2010-07-21 05:40:11

关于社区维基，我真的很抱歉。存储值是$ cur_sale的最后一个值。当我添加break语句时，我可以存储正确的值。但是，如果我想存储货币名称和销售价值。谢谢。 – Chandra 2010-07-21 05:48:57

假设所有的项目都在一个数组名为$项：

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

来源

2010-07-21 05:22:05 Cowlby

BoltClock提出的是正确的。此外，考虑改变你的阵列的结构：

 
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) 
)

这种结构将允许您编写更干净的代码，例如：

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

来源

2010-07-21 05:33:38 Anax

使用货币名称作为键的+1更具语义。 – BoltClock 2010-07-21 05:45:22

但它可能没有充分映射到数据的关键字 - 这看起来可能是一个订单或产品表，在这种情况下，货币不是该条目的正确关键。你能想象在货币数据库中将货币作为类似实体表的主键吗？ – Shabbyrobe 2010-07-21 05:54:15

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

如何指向右键以从数组中获取某些值？

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