ADD key and value into the end of array php - development

ADD key and value into the end of array php

$array1 = Array
(
    [0] => Array
        (
            [id] => 9
            [item_id] => 10486
            [name] => brief-about-youself

        )

    [1] => Array
        (
            [id] => 10
            [item_id] => 10486
            [name] => what-is-your-aim

        )

    [2] => Array
        (
            [id] => 11
            [item_id] => 10486
            [name] => how-would-you-rate-the-ease-of-registration

        )

    [3] => Array
        (
            [id] => 12
            [item_id] => 10486
            [name] => enter-your-date-of-birth

        )

)


$array2 = 
Array
(
    [0] => Array
        (
            [id] => 1
            [question_id] => 9
            [answer] => You have no changed Love it are you maxim ?

        )

    [1] => Array
        (
            [id] => 3
            [question_id] => 11
            [answer] => 9

        )

)

I want to push array1 to Array2

It should insert get_answer key to the each element if $array1 id match with $array2 question_id
ADD key and value into the end of array php. Thank you for your effort please guide. I work around but does not work

foreach($question as $key=>$value){

        if(isset($value['get_answer']) && $value['get_answer']['updated_by'] == $user_id){

            $question[$key]['answer'] = $value['get_answer']['answer'];
            unset($question[$key]['get_answer']);
        }

    }

from Laravel Questions and Answers https://laravelquestions.com/php/add-key-and-value-into-the-end-of-array-php/
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