转换多维数组到一个单一维的 [英] Converting a multidimensional array into a single dimensional one

问题描述

如果从一个函数，我现在回到这样一个多维数组。

 阵列（0 =＆GT;阵列（'A'=大于5），1 =＆GT;阵列（'A'=→8））
 

不过，我真的很需要的关键内容A什么是我要转换的最佳方式。

目前我一直在做这样的事情。

  $ new_array =阵列（）;的foreach（$ multi_array的AS $行）{
    $ new_array [] = $行['一']
}
 

解决方案

如果这是你所有的要求是，我认为这是最好的办法。还有什么都会有相同的处理。甚至通过阵列功能照看，我会说，这将是最好的方式。你可以，但是，使它成为一个功能，使多一点多才多艺的：

  $阵列=阵列（0 =＆GT;阵列（'A'=＆GT; 1），1 =＆GT;阵列（'A'=＆GT; 8））;$ new_array =弄平（$阵列，'一个'）;功能扁平化（$数组$指数='A'）{
     $收益率=阵列（）;     如果（is_array（$阵列））{
        的foreach（$数组作为$行）{
             $返回[] = $行[$指数]
        }
     }     返回$返回;
}
 

不过啊，我说你有什么是做的最有效的方式。

If from a function I am returned a multidimensional array like this..

array(0 => array('a' => 5), 1 => array('a' => 8))

But I just really need the contents of the key 'a' what is the best way for me to convert.

Current I have been doing something like..

$new_array = array();

foreach ($multi_array AS $row) {
    $new_array[] = $row['a']
}

解决方案

If that is all your requirements are, I think that is the best way. Anything else will have the same processing. Even after looking through the Array functions, I would say that this would be the best way. You can, however, make it a function to make it a bit more versatile:

$array = array(0 => array('a' => 1), 1 => array('a' => 8));

$new_array = flatten($array, 'a');    

function flatten($array, $index='a') {
     $return = array();

     if (is_array($array)) {
        foreach ($array as $row) {
             $return[] = $row[$index];
        }
     }

     return $return;
}

But yea, I would say what you have would be the most efficient way of doing it.

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