<!DOCTYPE html>
<html>
<body>
<?php
$num = 500;
$arr = [];
$i = -1;
while($num != 0)
{
$i++;
$arr[$i] = $num % 2;
$num = floor($num / 2);
}
echo "Binary number of 500 (decimal) is ";
//reverse the array and display
for($j=$i; $j>=0; $j--)
echo $arr[$j];
?>
</body>
</html>