How can the code provided be refactored to improve readability and maintainability while still achieving the desired outcome of finding prime number pairs with a difference of 2?

The code can be refactored by breaking down the logic into smaller, more readable functions and using meaningful variable names. By doing so, the code will be easier to understand and maintain. Additionally, comments can be added to explain the purpose of each section of code. 

function isPrime($num) {
    if ($num < 2) {
        return false;
    }
    for ($i = 2; $i <= sqrt($num); $i++) {
        if ($num % $i == 0) {
            return false;
        }
    }
    return true;
}

function findPrimePairs($start, $end) {
    $primePairs = [];
    for ($i = $start; $i <= $end - 2; $i++) {
        if (isPrime($i) && isPrime($i + 2)) {
            $primePairs[] = [$i, $i + 2];
        }
    }
    return $primePairs;
}

$start = 1;
$end = 100;
$primePairs = findPrimePairs($start, $end);

foreach ($primePairs as $pair) {
    echo $pair[0] . ", " . $pair[1] . "\n";
}

Keywords

refactoring readability maintainability prime numbers PHP functions

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