Untitled

<?php
echo "Find the sum of all the multiples of 3 or 5 below 1000. <br />";

$input = array(3, 5, 15); //15 is here so we can remove repeats (3 x 5 = 15)
$output = 0;

foreach($input as $key => $value){
    $l = 2;
while($value < 1000) {

    if($key == 2){ //Removes repeats from multiples of 5 and 3.

        $output = $output - $value;

    }else{

        $output = $output + $value;
        }

    $value = $input[$key] * $l;
    $l++;

    }
}

echo "Answer: $output"

?>