Question

How to find the sum of all the multiples of 3 or 5 below 1000 in PHP

Answer 1

$sum = 0;

for ($i = 1; $i < 1000; $i++) {
    if ($i % 3 == 0 || $i % 5 == 0) {
        $sum += $i;
    }
}

echo "The sum of all multiples of 3 or 5 below 1000 is: " . $sum . PHP_EOL;



/*
run:

The sum of all multiples of 3 or 5 below 1000 is: 233168

*/

 

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Answer 2

$sum = array_sum(
        array_filter(
            range(0, 999),
                fn($x) => $x % 3 == 0 || $x % 5 == 0
    )
);

echo "The sum of all multiples of 3 or 5 below 1000 is: " . $sum . PHP_EOL;



/*
run:

The sum of all multiples of 3 or 5 below 1000 is: 233168

*/

 

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