hexdump.php

<?php

function hexdump($data, $line = 16, $pos = 0)
{
	$pad = $line * 3;

	foreach (str_split($data, $line) as $chunk) {
		$hex = implode(' ', str_split(bin2hex($chunk), 2));
		$ascii = preg_replace('/[^\x20-\x7E]/', '.', $chunk);
		printf("%04x: %-{$pad}s |%-{$line}s|\n", $pos, $hex, $ascii);
		$pos += $line;
	}
}