- pow: documentation ( source)
<?php
$i = 5;
while ($i > 0):
$power = 1;
$bin = array();
if ($i / pow(2,$power) != 0) {
$bin[$power - 1] = 1;
$i = $i - pow(2,$power-1);
}
else {
$bin[$power - 1] = 0;
}
print $bin[$power - 1];
$power++;
endwhile;
?>