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Comparing multidimentional arrays in PHP

I have two arrays like these;

// $arr1 refers questions for a competetion.

`$arr1 = [
[0] => [
       answer => answer1 // $arr1[0]['answer']: correct answer to first question
], 
[1] => [
       answer => answer2 // $arr1[1]['answer']: correct answer to second question
];

// $arr2 refers competitors responses to questions.
$arr2 = [
[0] => [
       answer => [
                    [0] => response1, // first competitors response to first question(for answer1)
                    [1] => response2 // first competitors response to second question(for answer2)
                 ]`your text`
], 
[1] => [
       answer => [
                    [0] => response3, // second competitors response to first question(for answer1)
                    [1] => response4 // second competitors response to second question(for answer2)
                 ]
],
[2] => [
       answer => [
                    [0] => response5, // third competitors response to first question(for answer1)
                    [1] => response6 // third competitors response to second question(for answer2)
                 ]
];

….`

What i want to do is comparing competitors response with questions and find out who reponds correctly to all the questions.

I should compare answer1 (in $arr1′ 0 index) with $arr2’s response1, response3,response5 and for answer2 response2,response4,response6. And all responses should be exactly same with the correct answer.

I tried array_diff, array_intersect and since i am using Condeigniter4 also used CI array library array_deep_search, d0t_array_search but i could not figure it out. Any ideas please?

Tags:

2

Answers


  1. 0

    You can do something like:

    $result = [];

// Loop through each competitor
foreach ($arr2 as $competitorIndex => $competitorAnswers) {
    // Initialize a flag as correct for each competitor
    $result[$competitorIndex] = true;

    // Loop through each of the competitor's answers
    foreach ($competitorAnswers['answer'] as $questionIndex => $answer) {
        // If the answer is not the same as the correct answer set the result as false
        if ($answer != $arr1[$questionIndex]['answer']) {
            $result[$competitorIndex] = false;
            // No need to check further for this competitor
            break;
        }
    }
}

    The $result array will hold a boolean flag for each competitor, indicating whether they have all the correct answers. The index corresponds to each competitor’s responses in $arr2.

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  2. 0

    You could construct a correct response, and then compare each competitor’s entry against that:

    $correctResponse = [
    $arr1[0]['answer'],
    $arr1[1]['answer'],
];
$winners = array_filter($arr2, fn($competitorResponse) =>
    $competitorResponse['answer'] === $correctResponse
);

    $winners is then an array of all the competitors with the correct answers

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