从多维数组中递归删除空元素和子数组 [英] Recursively remove empty elements and subarrays from a multi-dimensional array

问题描述

对于从PHP数组中删除空元素这一古老的问题，我似乎找不到一个简单而直接的解决方案.

I can't seem to find a simple, straight-forward solution to the age-old problem of removing empty elements from arrays in PHP.

我的输入数组可能看起来像这样:

My input array may look like this:

Array ( [0] => Array ( [Name] => [EmailAddress] => ) ) 

(依此类推，如果还有更多数据，尽管可能没有...)

(And so on, if there's more data, although there may not be...)

如果是上面的样子，我希望它在处理后完全为空.

If it looks like the above, I want it to be completely empty after I've processed it.

所以print_r($array);将输出:

Array ( )

如果我运行$arrayX = array_filter($arrayX);，我仍然会得到相同 print_r的输出.不过，我到过的所有地方都表明这是在PHP5中删除空数组元素的最简单方法.

If I run $arrayX = array_filter($arrayX); I still get the same print_r output. Everywhere I've looked suggests this is the simplest way of removing empty array elements in PHP5, however.

我也尝试过$arrayX = array_filter($arrayX,'empty_array');，但出现以下错误:

I also tried $arrayX = array_filter($arrayX,'empty_array'); but I got the following error:

警告:array_filter()[function.array-filter]:第二个参数'empty_array'应该是有效的回调

Warning: array_filter() [function.array-filter]: The second argument, 'empty_array', should be a valid callback

我在做什么错了?

推荐答案

尝试使用 array_map() 将过滤器应用于$array中的每个数组:

Try using array_map() to apply the filter to every array in $array:

$array = array_map('array_filter', $array);
$array = array_filter($array);

演示: http://codepad.org/xfXEeApj

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