无法从多维数组中删除空键

Question

我正在尝试使用 array_filter 函数从数组中删除数组元素。它工作正常，但总是有一个元素没有被删除。

array_combine 使用一个简单的数组构建数组，另一个使用 array_chunk 构建。

这是我的代码：

$arr_a = array("AAA","","CCC","");

$arr_b = array("a1","b1","a2","b2","a3","b3","a4","b4");

$arr_c = array_chunk($arr_b,2);

$c = array_combine($arr_a,$arr_c);

$limpn_url = array_filter($c);

如果我遇到错误，我不会费心在这里发布问题。但是返回没有错误。

制作时print_r($limpn_url); 输出是： Array ( [AAA] => Array ( [0] => a1 [1] => b1 ) [] => Array ( [0] => a4 [1] => b4 ) [CCC] => Array ( [0] => a3 [1] => b3 ) )

*注意[] => Array ( [0] => a4 [1] => b4 ) 不应该在那里。其他空元素已正确删除...

Answer 1

您可以使用一些数组函数来删除空键。

$arr_a = array("AAA","","CCC","");

$arr_b = array("a1","b1","a2","b2","a3","b3","a4","b4");

$arr_c = array_chunk($arr_b,2);

$c = array_combine($arr_a,$arr_c);

$limp= array_filter($c);

$filteredkeys = array_filter(array_keys($limp)); // here i remove the "" key

$filtered = array_intersect_key($limp, array_flip($filteredkeys)); // since $filterdkeys is values i need to flip it and intersect with $limp
var_dump($filtered);

输出：

array(2) {
  ["AAA"]=>
  array(2) {
    [0]=>
    string(2) "a1"
    [1]=>
    string(2) "b1"
  }
  ["CCC"]=>
  array(2) {
    [0]=>
    string(2) "a3"
    [1]=>
    string(2) "b3"
  }
}

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