padded, reversed, hex strings without nulls

hex_no_nulls.php

#!/usr/bin/php
<?php

function ascii_hex ($char) {
    $ret = '';
    for ($i=0;$i<strlen($char);++$i)
        $ret .= dechex(ord($char{$i}));
    if (strlen($ret) < 2) return '0'.$ret;
    return $ret;
}

function string_hex_nonull ($string) {
    $string = strrev($string);
    $len = strlen($string);
    $packs = floor($len / 8);
    $pad = 8 - $len % 8;
    $hex_all = array();
    $hex = '0x';

    for ($i=0;$i<$pad;++$i)
        $hex .= 'AA';
    for ($i=0;$i<8-$pad;++$i)
        $hex .= ascii_hex($string{$i});

    array_push($hex_all, $hex);

    for ($i=0;$i<$packs;++$i)
        array_push($hex_all, '0x'. ascii_hex(substr($string, ($i+1)*8-$pad, 8)));

    return $hex_all;
}

$orig = "some text without sense we want 'A' padded, reversed, and in hex!!\n";

$hex_all = string_hex_nonull($orig);

foreach (array_reverse($hex_all) as $hex) {
    print $hex ."\t";
    $hex = strrev(substr($hex, 2));
    for ($i=0;$i<16;$i+=2) {
        if ($hex{$i+1}.$hex{$i} == 'AA') break;
        print chr(hexdec($hex{$i+1}.$hex{$i}));
    }
    print "\n";
}