阵列相交于数组的键？ [英] Array intersect on key in array?

问题描述

我有了国家的数组：

 阵列（
'AF'=＆GT;'阿富汗，
'AL'=＆GT;阿尔巴尼亚，
'DZ'=＆GT;'阿尔及利亚，
'为'=＆GT;美国萨摩亚，
）;
 

和我有了一些键在它的另一个阵列

 阵列（'基地'，'DZ'）;
 

我要打电话，将采取两个数组作为参数和返回功能

 阵列（
'AL'=＆GT;阿尔巴尼亚，
'DZ'=＆GT;'阿尔及利亚，
）;
 

我知道PHP内置函数比较键或价值观，但似乎这些功能都期望你有两个一维数组两个二维数组。

我可以在 array_keys（）循环为第一阵列，​​并做了 in_array（）上的每个按键检查，但似乎真的inefficent ...

解决方案

  $选择=阵列（'基地'，'DZ'）;
$ =过滤array_intersect_key（$国家，array_flip（$选择））;
后续代码var_dump（$过滤）;
 

I have an array that has countries:

array(
'AF'=>'AFGHANISTAN',
'AL'=>'ALBANIA',
'DZ'=>'ALGERIA',
'AS'=>'AMERICAN SAMOA',
);

and I have another array that has some of the keys in it

array('AL', 'DZ');

I want to call a function that will take both arrays as parameters and return

array(
'AL'=>'ALBANIA',
'DZ'=>'ALGERIA',
);

I know php has built in functions to compare the keys, or the values, but it seems those functions all expect you to have two 1D arrays' or two 2D arrays.

I could loop over array_keys() for the first array and do a in_array() check on each key, but that seems really inefficent...

解决方案

$selection = array('AL', 'DZ');
$filtered = array_intersect_key($countries, array_flip($selection));
var_dump($filtered);

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