Convert from ascii to hex in php

Question

I'm trying to convert from ASCII to HEX in PHP but get a different result to some of the online tools that are available. I know the result I'm looking for so the online tool's result appear to be correct and my code incorrect but I can't work out why.

String:         2Ffbj?DoyXOU
Correct output: 32 46 66 62 6a 3f 44 6f 79 58 4f 55 (from linked site above)
My output:      32 46 66 62 6a 3f 44 6f 79 58 4f 75

My script:

echo bin2hex(utf8_decode("2Ffbj?DoyXOU"));

Where is the fault?

Patrick Maciel · Accepted Answer · 2014-07-04 13:40:45Z

11

Use that:

function ascii2hex($ascii) {
  $hex = '';
  for ($i = 0; $i < strlen($ascii); $i++) {
    $byte = strtoupper(dechex(ord($ascii{$i})));
    $byte = str_repeat('0', 2 - strlen($byte)).$byte;
    $hex.=$byte." ";
  }
  return $hex;
}

The result:

ascii to hex

edited Jul 4, 2014 at 13:40

answered Jul 4, 2014 at 13:20

Patrick Maciel

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3 Comments

dialogik Over a year ago

Can you explain why the OPs way doesn't return proper result?

dialogik Over a year ago

I was just curious why this algorithm may work while bin2hex() won't return proper result.

Kladskull Over a year ago

@GottliebNotschnabel it is not working because bin2hex (and) hex2bin are kind of not what you expect. Bin in php in this case is a string of 0's and 1's eg.: "010110101" not binary data.

Taras Kravchuk · Accepted Answer · 2021-06-29 08:48:01Z

1

Try this:

function ascii2hex($arg){
   return implode(" ",array_map(fn($x) => sprintf("%02s",strtoupper(dechex(ord($x)))),str_split($arg)));
}

edited Jun 29, 2021 at 8:48

answered Jun 29, 2021 at 8:35

Taras Kravchuk

112 bronze badges

Comments

I-Ping Neal Hsieh · Accepted Answer · 2021-01-21 10:19:31Z

0

Thanks Patrick Maciel for the good answer. Now if use PHP 7.4, there maybe an error message "Array and string offset access syntax with curly braces is no longer supported". Using "[" and "]" to replace "{" and "}" can solve the problem.

Reference: Array and string offset access syntax with curly braces is deprecated

answered Jan 21, 2021 at 10:19

I-Ping Neal Hsieh

1

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