I have an array of bytes that I'd like to map to their ASCII equivalents.
How can I do this?
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2Could we see some code ? What have you tried already ?Johann du Toit– Johann du Toit2011-03-29 13:10:21 +00:00Commented Mar 29, 2011 at 13:10
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3what do you mean by convert? turning asciivalues into their character counter parts?Fredrik– Fredrik2011-03-29 13:11:14 +00:00Commented Mar 29, 2011 at 13:11
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1What is your question? Is it related to your previous one? stackoverflow.com/questions/5470030/…fabrik– fabrik2011-03-29 13:11:58 +00:00Commented Mar 29, 2011 at 13:11
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1thought this was a duplicate of stackoverflow.com/questions/885597/string-to-byte-array-in-php BUT IT'S NOT, SORRY (can't remove the post)fsonmezay– fsonmezay2011-03-29 13:14:00 +00:00Commented Mar 29, 2011 at 13:14
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5 Answers
If by array of bytes you mean:
$bytes = array(255, 0, 55, 42, 17, );
array_map()
Then it's as simple as:
$string = implode(array_map("chr", $bytes));
foreach()
Which is the compact version of:
$string = "";
foreach ($bytes as $chr) {
$string .= chr($chr);
}
// Might be a bit speedier due to not constructing a temporary array.
pack()
But the most advisable alternative could be to use pack("C*", [$array...]), even though it requires a funky array workaround in PHP to pass the integer list:
$str = call_user_func_array("pack", array_merge(array("C*"), $bytes)));
That construct is also more useful if you might need to switch from bytes C* (for ASCII strings) to words S* (for UCS2) or even have a list of 32bit integers L* (e.g. a UCS4 Unicode string).
9 Comments
Alix Axel
@alex: I'm okay with the whole badge chasing thing, but these kind of strategies shouldn't be allowed. Changing the title to please search engines while improving a bit a bad and simple question is one thing, but bounty? Seriously...
alex
@Alix Isn't one of the goals of the site to give good results for search engines, to knock off Experts Exchange, W3 Schools, etc? And what is so bad with a bounty? I've always wanted to place one on someone else's question, and I thought this was a good opportunity. The question itself isn't that bad, obviously the OP could of made some effort on their behalf, but it is still a decent question. Do you have the same objection to this recent bounty ?
Alix Axel
@alex: I've nothing against the edit (just the fact that you publicly advertised that you did it for the bump), but the point of a bounty is to attract attention on questions that still have no accepted solution. In this case, the question is crappy and subjective, and the solution had already presented itself 2 months ago in the form of a perfectly good and valid one-liner. The fact that you haven't even awarded the bounty yet just reflects your true (SEO) purpose. If you do this, at least try not to be so obvious - the last thing I want is copycats using SO tools for the wrong purposes.
mario
@Alix Axel. I've taken offense a few weeks ago when someone else offered a bounty himself after already aquiring the accepted answer (disguised repwhoring with a fairly stupid opinion post no less). It's not quite the same here. While it's already answered workably, there are a few more options. Some funny answers are still possible - two of which *I* dare not mention on SO. -- Also not sure if anyone will bother, but I'm certain @alex would put the attention award (which is all the bounty system shall do) on something more interesting if it comes along.
Eaton Emmerich
The 'call_user_func_array()' should really be replaced by the Argument unpacking via '...' see: php.net/manual/en/migration56.new-features.php So the code would be pack('C*',...$bytes)
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Ammending the answer by mario for using pack():
Since PHP 5.5, you can use Argument unpacking via ...
$str = pack('C*', ...$bytes);
The other functions are fine to use, but it is preferred to have readable code.
Yet another way:
$str = vsprintf(str_repeat('%c', count($bytes)), $bytes);
Hurray!
Comments
Mario has already provided the best fit, but here is a more exotic way to achieve this.
$str = call_user_func_array(
'sprintf',
array_merge((array) str_repeat('%c', count($bytes)), $bytes)
);
Comments
Below is an example of converting Yodlee MFA ByteArray to CAPTCHA image. Hope it helps someone...
You simply have to convert the byte array to string, then encode to base64.
Here is a PHP example:
$byteArray = $obj_response->fieldInfo->image; //Here you get the image from the API getMFAResponse
$string = implode(array_map("chr", $byteArray)); //Convert it to string
$base64 = base64_encode($string); //Encode to base64
$img = "<img src= 'data:image/jpeg;base64, $base64' />"; //Create the image
print($img); //Display the image
