<?php

$mask = 0xff0000;
$mask2 = 0x00ff00;
$mask3 = 0x0000ff;
$color = 0xf0ff23;

echo '<pre>';
printf('%b', $color);
echo "\n";
printf('%x', ($color & $mask) >> 16);
echo "\n";
printf('%x', ($color & $mask2) >> 8);
echo "\n";
printf('%x', ($color & $mask3));
echo '</pre>';