Question

我有一个这样的数组：

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => Firstname one
            [2] => Lastname one
        )

    [1] => Array
        (
            [0] => 2
            [1] => Firstname two
            [2] => Lastname two
        )

    [2] => Array
        (
            [0] => 3
            [1] => Firstname three
            [2] => Lastname three
        )
)

现在，我想删除整个index 1，即数组中的所有名字。我计划通过遍历整个数组并删除它的索引来使用array_splice。但是有更好的方法。（我希望在删除元素后重新编制索引。）

Answer 1

$yourarray = array_map(function($el) {
  unset($el[1]); //remove index 1
  return array_values($el); //return and reindex
}, $yourarray);

Answer 2

您还可以使用array_slice功能

foreach($array as $k=>$v)
{
    array_splice($v, 1,1);
    $array[$k] = $v;
}

输出：

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => Lastname one
        )

    [1] => Array
        (
            [0] => 1
            [1] => Lastname two
        )

    [2] => Array
        (
            [0] => 1
            [1] => Lastname three
        )

)

Answer 3

您应该使用array_map

$input_array = [[1,'Firstname one','Lastname one'],
                [2,'Firstname two','Lastname two'],
                [3,'Firstname three','Lastname three']];

$resultArray = array_map(function($record) { 
  return [$record[0], $record[2]]; // add your desired records
}, $input_array);

echo '<pre>'; print_r($resultArray);

<强>输出： -

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => Lastname one
        )

    [1] => Array
        (
            [0] => 2
            [1] => Lastname two
        )

    [2] => Array
        (
            [0] => 3
            [1] => Lastname three
        )

)

Answer 4

foreach($array as $k=>$v)
{
    unset($array[$k][1]); /// Chnage the key of array which you want to remove
}

从2d数组PHP

4 个答案: