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@ 2022-07-30T01:03:18Z

<?php

$array = [
    [
        'category_id' => 1,
        'question_id' => 1,
        'option_id' => 2,
        'title' => 'Do you wear glasses?',
        'answer' => 'no'
    ],
    [
        'category_id' => 1,
        'question_id' => 2,
        'option_id' => 3,
        'title' => 'Your hobbies ?',
        'answer' => 'movies'
    ],
    [
        'category_id' => 1,
        'question_id' => 4,
        'option_id' => 8,
        'title' => 'what is your status?',
        'answer' => 'single'
    ],
    [
        'category_id' => 1,
        'question_id' => 2,
        'option_id' => 1,
        'title' => 'Your hobbies ?',
        'answer' => 'travel'
    ],
];

$result = [];
foreach ($array as $row) {
    $compositeKey = $row['category_id'] . '_' . $row['question_id'];
    if (!isset($result[$compositeKey])) {
        $result[$compositeKey] = $row;
    } else {
        $result[$compositeKey]['answer'] .= ",{$row['answer']}";
    }
}
var_export(
    array_values(
        $result
    )
);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'category_id' => 1, 'question_id' => 1, 'option_id' => 2, 'title' => 'Do you wear glasses?', 'answer' => 'no', ), 1 => array ( 'category_id' => 1, 'question_id' => 2, 'option_id' => 3, 'title' => 'Your hobbies ?', 'answer' => 'movies,travel', ), 2 => array ( 'category_id' => 1, 'question_id' => 4, 'option_id' => 8, 'title' => 'what is your status?', 'answer' => 'single', ), )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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