在PHP中检索多维数组的键值 [英] Retrieve key value of multidimensional array in PHP

问题描述

如何引用多维数组的键?这是数组:

How do I reference the key of a multidimensional array? Here is the array:

Array
(
[Nov 18, 2011] => Array
    (
        [C] => 3
        [I] => 1
    )
[Nov 22, 2011] => Array
    (
        [C] => 2
    )
)

这是foreach循环:

and here is the foreach loop:

foreach($array as $date) { 
    foreach ($date as $k=>$v) {         
        // how to I reference the value of $billdate here ?
    }            
} 

在内部 foreach循环中引用$k和$v很容易，但是如何引用外部中包含的日期值> foreach循环?

It is easy enough to reference the $k and $v inside the inner foreach loop, but how do I reference the date value contained in the outer foreach loop?

谢谢您的帮助.

推荐答案

在外部foreach循环中为键分配一个值(显然名为$billdate).

Assign the key a value (apparently named $billdate) in the outer foreach loop.

foreach( $array as $billdate => $date) { 
    foreach( $date as $k => $v) {         
        echo $billdate; // Prints something like Nov 18, 2011
    }            
} 

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