<?php

/* Stolen from the intertubes */
function hex_dump($data)
{
    static $from = '';
    static $to = '';

    static $width = 16; # number of bytes per line

    static $pad = '.'; # padding for non-visible characters

    if ($from==='')
    {
        for ($i=0; $i<=0xFF; $i++)
        {
            $from .= chr($i);
            $to .= ($i >= 0x20 && $i <= 0x7E) ? chr($i) : $pad;
        }
    }

    $hex = str_split(bin2hex($data), $width*2);
    $chars = str_split(strtr($data, $from, $to), $width);

    $offset = 0;
    foreach ($hex as $i => $line)
    {
        $length = $width * 3;
        $dump = sprintf("%-{$length}s", implode(' ', str_split($line,2)));
        echo sprintf('%6X',$offset).' : '.$dump . ' [' . $chars[$i] . ']'."\n";
        $offset += $width;
    }
}