How can you optimize the code provided to improve efficiency and readability in PHP?

The code can be optimized by using a more efficient way to check if a number is prime. One way to do this is by only checking divisibility up to the square root of the number. Additionally, we can improve readability by breaking down the logic into smaller, more understandable functions. 

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

function printPrimesInRange($start, $end){
    for($i = $start; $i <= $end; $i++){
        if(isPrime($i)){
            echo $i . " ";
        }
    }
}

$start = 10;
$end = 50;
printPrimesInRange($start, $end);

Keywords

PHP optimization efficiency readability code quality

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