通過多維數組運行foreach循環

Question

嗨我仍然很新的PHP，我想保存三個不同的東西在我將拉動我的數據庫的數組。現在我只需要幫助設置陣列。對於數據庫的每一行，我想從中排序3件事，一年中的一週（比如43），那一週我工作的小時數（比如說29）和年份（比如說2013）。所以剛成立我放了一堆假數據，像這樣的數組：

$hours = array(
    "week" => array(1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51), 
    "hours" => array(65,56,34,76,87,43,23,43,53,23,65,34,23,54,65,75,34,23,34,54,34,54,65,34,23,76), 
    "year" => array(2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013,2013, 2014,2014,2014,2014,2014) 
); 

我的第一個問題是：我的陣列正確設置什麼我試着來形容。 我的第二個問題：如果它設置正確，我如何運行一個foreach循環，以便我可以訪問所有三個變量，一年的一週，幾個小時和一年？

Answer 1

正如我所見，你需要它有所不同的方式。

在數據庫中應該有一些表格，列表爲：id,week,hours和year。

所以在PHP相當於這將是：

$result = [ 
    ['id' => 1, 'week' => 1, 'hours' => 40, 'year' => 2014], 
    ['id' => 2, 'week' => 3, 'hours' => 53, 'year' => 2014], 
    ['id' => 3, 'week' => 14, 'hours' => 32, 'year' => 2014], 
]; 

然後你可以使用的foreach找到某行：

$target = 3; # assume target week we trying to search is 3 

$row_found = null; 

foreach($result as $row) { 
    if($row['week'] == $target) { 
    $row_found = $row; 

    break; 
    } 
} 

與您examle你這將打破，如果你的陣列由一些原因會有所不同。

Additionaly，您可以按周重新索引你的數組：

$result = [ # that's result from mysql 
    ['id' => 1, 'week' => 1, 'hours' => 40, 'year' => 2014], 
    ['id' => 2, 'week' => 3, 'hours' => 53, 'year' => 2014], 
    ['id' => 3, 'week' => 14, 'hours' => 32, 'year' => 2014], 
]; 

$result_indexed = []; 

foreach($result as $row) { 
    $result_indexed[$row['week']] = $row; 
} 

然後某一週可以很容易地與$result_indexed[3]訪問例如用於星期＃3