packing hex into binary, checking if bits are properly set

gistfile1.php

<?php

$bin = pack('C*', 0xFF, 0xFA, 0x2C, 0x32, 0xFF, 0xF0, 0xFF);
$hex = unpack('H*', $bin);
$hex = $hex[1];

echo "\nbinary: ";
$parts = explode(' ', chunk_split($hex, 2, ' '));
foreach ($parts as $part) {
    if ($part)  printf('%1$08s ', base_convert($part, 16, 2));
}

echo "\nhex:    ";
foreach ($parts as $part) {
    if ($part)  printf('  0x%s   ', $part);
}