从多维数组中删除空值
我研究了很多关于该主题的stackoverflow上发布的问题和答案，但我仍然无法找到解决以下问题的解决方案。从多维数组中删除空值
我需要从这个链接提供的文本生成一个数组，减去一些特定的行：https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf。这部分我能够做到。
PHP代码：
$arr = file('https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf');
$arr = preg_replace('/^(?![a-z0-9]{2}:[a-z0-9]{2}:[a-z0-9]{2}\s).*$/i', '', $arr);
$arr = preg_replace ('/#/i', '',$arr);
$arr = preg_replace('/\t+/', ' ', $arr);
$arr = preg_replace('/\s{2,}/', ' ', $arr);
$arr = preg_replace('/ /', '~', $arr, 2);
foreach ($arr as $field)
{
$macList[] = explode('~', $field);
}
echo "<pre>";
print_r($macList);
echo "</pre>";
的问题是，当我使用print_r，第52子阵列是空的，再加上一些几十个在底部。我无法弄清楚如何删除它们。
减少print_r输出，因为完整的输出返回25770次阵列：
Array
(
[0] => Array
(
[0] =>
)
[1] => Array
(
[0] =>
)
[2] => Array
(
[0] =>
)
[3] => Array
(
[0] =>
)
[4] => Array
(
[0] =>
)
[5] => Array
(
[0] =>
)
[6] => Array
(
[0] =>
)
[7] => Array
(
[0] =>
)
[8] => Array
(
[0] =>
)
[9] => Array
(
[0] =>
)
[10] => Array
(
[0] =>
)
[11] => Array
(
[0] =>
)
[12] => Array
(
[0] =>
)
[13] => Array
(
[0] =>
)
[14] => Array
(
[0] =>
)
[15] => Array
(
[0] =>
)
[16] => Array
(
[0] =>
)
[17] => Array
(
[0] =>
)
[18] => Array
(
[0] =>
)
[19] => Array
(
[0] =>
)
[20] => Array
(
[0] =>
)
[21] => Array
(
[0] =>
)
[22] => Array
(
[0] =>
)
[23] => Array
(
[0] =>
)
[24] => Array
(
[0] =>
)
[25] => Array
(
[0] =>
)
[26] => Array
(
[0] =>
)
[27] => Array
(
[0] =>
)
[28] => Array
(
[0] =>
)
[29] => Array
(
[0] =>
)
[30] => Array
(
[0] =>
)
[31] => Array
(
[0] =>
)
[32] => Array
(
[0] =>
)
[33] => Array
(
[0] =>
)
[34] => Array
(
[0] =>
)
[35] => Array
(
[0] =>
)
[36] => Array
(
[0] =>
)
[37] => Array
(
[0] =>
)
[38] => Array
(
[0] =>
)
[39] => Array
(
[0] =>
)
[40] => Array
(
[0] =>
)
[41] => Array
(
[0] =>
)
[42] => Array
(
[0] =>
)
[43] => Array
(
[0] =>
)
[44] => Array
(
[0] =>
)
[45] => Array
(
[0] =>
)
[46] => Array
(
[0] =>
)
[47] => Array
(
[0] =>
)
[48] => Array
(
[0] =>
)
[49] => Array
(
[0] =>
)
[50] => Array
(
[0] =>
)
[51] => Array
(
[0] =>
)
[52] => Array
(
[0] => 00:00:00
[1] => 00:00:00
[2] => Officially Xerox, but 0:0:0:0:0:0 is more common
)
)
问题：如何删除这些52（0〜51）空数组？没有什么我尝试过。
而不是尝试删除空键，而不是在第一个地方添加空数组： 编辑看起来'空'数组实际上不是空的，而是包含一个空格字符的单个元素。以除去可以用trim，array_map和array_filter结合empty：
foreach ($arr as $field)
{
$temp = explode('~', $field);
if(!empty(array_filter(array_map('trim', $temp))))
{
$macList[] = $temp;
}
}
echo "<pre>";
print_r($macList);
echo "</pre>";
非常感谢您花时间回答。不幸的是，在应用您的建议之后，我得到的结果表明仍在显示空的子数组。也许我错误地应用了你的代码？ [http://hastebin.com/geyusosiyo](http://hastebin.com/geyusosiyo） – thiago 2015-01-15 16:10:32
@thiago好的，请参阅编辑，我最初误读 – Steve 2015-01-15 16:16:13
再次感谢。我很抱歉花时间。下面的代码在你的新建议之后，仍然返回那些空的数组：[http://hastebin.com/umijaqufel](http://hastebin.com/umijaqufel）。 – thiago 2015-01-15 16:32:40
作为使用array_filter()和假设它始终是一个空的单个元件阵列的一个示例：
$new_array = array_filter($array, function($elements) {
return !empty($elements[0]);
});
McCreary先生，我真诚地感谢您的回答。我遵循你的建议，但不幸的是，空数组仍在显示。链接到我用来测试的代码：[http://hastebin.com/tucipapaco](http://hastebin.com/tucipapaco）。也许我错误地实施了你的建议？ – thiago 2015-01-15 16:41:16
循环通过它们和使用unset（）就像那样简单 – geekman 2015-01-15 15:41:03