PHP - Number: Converting Between Bases

<?php
//define number
$num = 100;

//convert to binary
//result: "Binary: 1100100 "
$bin = decbin($num);
echo "Binary: $bin ";

//convert to octal
//result: "Octal: 144 "
$oct = decoct($num);
echo "Octal: $oct ";

//convert to hexadecimal
//result: "Hexadecimal: 64 "
$hex = dechex($num);
echo "Hexadecimal: $hex ";

//convert to base 6;
//result: "Base6: 244"
$base6 = base_convert($num, 10, 6);
echo "Base6: $base6";
?>

<?php
//function to convert RGB colors to their hex values
function rgb2hex($r, $g, $b) {
return sprintf("#%02s%02s%02s", dechex($r), dechex($g), ↵
dechex($b));
}

//result: "#00ff40"
$hex = rgb2hex(0,255,64);
echo $hex;
?>