Convert (doublebyte) string to Hex

Question

Let's say I have the word "Russian" written in Cyrillic. This is would be the quivalent of the following in Hex:

&#1056;&#1091;&#1089;&#1089;&#1082;&#1080;&#1081;

My question is: how do I write a function which will go from "Russian" in Cyrillic to it's hex value as above? Could this same function work also for singel byte characters?

That won't convert every letter, only applicable special characters. — SeanCannon
– SeanCannon, Commented Aug 10, 2011 at 17:06
@brad, @alien: use htmlentities() which should convert most characters — knittl
– knittl, Commented Aug 10, 2011 at 17:12
Doesn't work with cryllic: echo htmlentities('русский'); // outputs Ñ€ÑƒÑÑÐºÐ¸Ð¹ — SeanCannon
– SeanCannon, Commented Aug 10, 2011 at 17:14
htmlentities converts nothing of those, use mb_encode_numericentity. — hakre
– hakre, Commented Aug 10, 2011 at 17:34

hakre · Accepted Answer · 2011-08-10 17:28:12Z

5

The 〹 thingies are called HTML Entities. In PHP there is a function that can create these: mb_encode_numericentity^Docs, it's part of the Multibyte String extension (Demo):

$cyrillic = 'русский';

$encoding = 'UTF-8';
$convmap = array(0, 0xffff, 0, 0xffff);
$encoded = mb_encode_numericentity($cyrillic, $convmap, $encoding);

echo $encoded; # &#1088;&#1091;&#1089;&#1089;&#1082;&#1080;&#1081;

However: You need to know the encoding of your Cyrillic string. In this case I've chosen UTF-8, depending on it you need to modify the $encoding parameter of the function and the $convmap array.

answered Aug 10, 2011 at 17:28

hakre

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SeanCannon · Accepted Answer · 2011-08-10 17:11:28Z

2

Your provided example isn't hex, but if you want to convert to hex, try this:

function strToHex($string)
{
    $hex='';
    for ($i=0; $i < strlen($string); $i++)
    {
        $hex .= dechex(ord($string[$i]));
    }
    return $hex;
}

function hexToStr($hex)
{
    $string='';
    for ($i=0; $i < strlen($hex)-1; $i+=2)
    {
        $string .= chr(hexdec($hex[$i].$hex[$i+1]));
    }
    return $string;
}

echo strToHex('русский'); // d180d183d181d181d0bad0b8d0b9

edited Aug 10, 2011 at 17:11

answered Aug 10, 2011 at 17:05

SeanCannon

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1 Comment

Dave Carpeneto Over a year ago

One note - control characters (such as \n) cause issue, so you'll need to 0-pad them by changing the " dechex(ord($string[$i])) " bit to " str_pad(dechex(ord($string[$i])), 2, "0", STR_PAD_LEFT) " in the strToHex() call. But a fantastic answer overall - thanks very much for this :-)

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