How to delete array of array if particular key doesn't exist in it?

Question

I have collection of array and i want delete array of array where "answer_id" key is not exits. my array look like this.

Array
(
    [0] => Array
        (
            [question_no] => 1
            [subject_id] => 1
            [question_id] => 255
            [currect_ans_id] => 2657
            [time_taken] => 110
            [is_visited] => 1
            [is_saved] => 0
            [answer_id] => 2659
        )

    [1] => Array
        (
            [question_no] => 2
            [subject_id] => 1
            [question_id] => 256
            [currect_ans_id] => 2662
            [time_taken] => 0
            [is_visited] => 1
            [is_saved] => 0
        )


)

and want array like this(where answer_id key exits).

  Array
    (
        [0] => Array
            (
                [question_no] => 1
                [subject_id] => 1
                [question_id] => 255
                [currect_ans_id] => 2657
                [time_taken] => 110
                [is_visited] => 1
                [is_saved] => 0
                [answer_id] => 2659
            ) 
)

@VeerenderMishra No way of doing it without using a loop. All inbuilt functions also use a loop. — mighty_dev
– mighty_dev, Commented May 1, 2020 at 12:57
@vivek_23 problem has been solve.thank you so much for your quick response. — Veerender Mishra
– Veerender Mishra, Commented May 1, 2020 at 13:02
You would normally be expected to make some effort in solving the problem rather than just asking others to solve it for you. — Nigel Ren
– Nigel Ren, Commented May 1, 2020 at 13:18

Nick · Accepted Answer · 2020-05-01 12:54:47Z

4

You can use array_filter to remove entries which don't have an answer_id:

$output = array_filter($input, function ($a) { return isset($a['answer_id']); });

Demo on 3v4l.org

answered May 1, 2020 at 12:54

Nick

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