我在索引中只有一个数组，所以我想将索引移动到上一个索引？ 请参阅下面的参考：

Question

Array
(
    [data] => Array
        (
            [0] => Array
                (
                    ['degree_level'] => Bachelor's
                )

            [1] => Array
                (
                    ['field_of_study'] => Science
                )

            [2] => Array
                (
                    ['grade_point'] => 3
                )

            [3] => Array
                (
                    ['criteria'] => desired
                )

        )

)

What I want :

Array
(
    [data] => Array
        (
            ['degree_level'] => Bachelor's

            ['field_of_study'] => Science

            ['grade_point'] => 3

            ['criteria'] => desired

        )

)

Answer 1

$output = array_map(function($item) { return $item[0]; }, $myArray);