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Code Challenge : Create a PHP function to find the intersection of two arrays - FirstDue Interview Questions

 This was the client round question for code challenge..

Create a PHP function to find the intersection of two arrays.


<?php

function FindIntersection($strArr)
{
    // Split the strings into arrays and convert to integers
    foreach ($strArr as $index => $element) {
        $strArr[$index] =  array_map('intval', explode(',', $element));
    }

    $main_match_array = $strArr[0];
    array_shift($strArr);
    $interarray = [];
    foreach ($strArr as  $each_chunk) {

        foreach ($main_match_array as $in => $number) {
            if (in_array($number, $each_chunk)) {
                $interarray[$number] = $number;
            } else {
                unset($interarray[$number]);
            }
        }
    }
    return implode(', ', $interarray);
}
echo '<pre>';

$result = FindIntersection(["10,2, 3", "6,3,8,2,10", "10"]);
echo $result; // Output: 1,4,13

echo "\n";
echo FindIntersection(["1, 3, 9,", "1, "]) . "\n"; // Output: 1
echo FindIntersection(["1, 2", "4","8"]) . "\n"; // Output: (empty)

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