PHP: Hypertext Preprocessor (original) (raw)

rawurldecode

(PHP 4, PHP 5, PHP 7, PHP 8)

rawurldecode — Decode URL-encoded strings

Description

Parameters

string

The URL to be decoded.

Return Values

Returns the decoded URL, as a string.

Examples

Example #1 rawurldecode() example

<?phpecho rawurldecode('foo%20bar%40baz'); // foo bar@baz?>

Notes

Note:

rawurldecode() does not decode plus symbols ('+') into spaces. urldecode() does.

Found A Problem?

php dot net at hiddemann dot org ¶

19 years ago

To sum it up: the only difference of this function to the urldecode function is that the "+" character won't get translated.

Javier A. Segura at gmail dot com ¶

17 years ago

`Hi everybody =) My name is Javier and I'm from Argentina.
I've had a little issue with latin characters like ñ","Ñ","á","é","í", etc.
They are not decoded with rawurlencode(), so I've made this:
<?php
function urlRawDecode($raw_url_encoded)
{

Hex conversion table

$hex_table = array(
0 => 0x00,
1 => 0x01,
2 => 0x02,
3 => 0x03,
4 => 0x04,
5 => 0x05,
6 => 0x06,
7 => 0x07,
8 => 0x08,
9 => 0x09,
"A"=> 0x0a,
"B"=> 0x0b,
"C"=> 0x0c,
"D"=> 0x0d,
"E"=> 0x0e,
"F"=> 0x0f
);# Fixin' latin character problem
if(preg_match_all("/%C3%([A-Z0-9]{2})/i", rawurlencoded,raw_url_encoded,rawurlencoded,res))
{ res=arrayunique(res = array_unique(res=arrayunique(res = $res[1]);
$arr_unicoded = array();
foreach($res as key=>key => key=>value){
$arr_unicoded[] = chr(
(0xc0 | ($hex_table[substr($value,0,1)]<<4))
| (0x03 & hextable[substr(hex_table[substr(hextable[substr(value,1,1)])
); res[res[res[key] = "%C3%" . $value;
}$raw_url_encoded = str_replace(
$res,
$arr_unicoded,
$raw_url_encoded
);
}# Return decoded raw url encoded data
return rawurldecode($raw_url_encoded);
}

urlRawDecode("%C3%A1%C3%B1");// output:
// áñ?>
For example, you have the character "ñ" encoded like this "%C3%B1".
This is nothing more and nothing less than 0xc3 and 0xb1,
they are binary numbers, (HHHH LLLL, where HHHH=High and LLLL=Low).
0xc3 = 1100 0011 (binary 8 bit word), 0xb1 = 1011 0001 (binary 8 bit word),
To convert a raw encoded character to ascii we have to make boolean operations
between this two operands (0xc3 and 0xb1), boolean algebra were defined by George
Boole, we need to use them here. The first one we going to use is the
logical OR ("|" or "pipe") and logical AND ("&" or "and person").

A logical OR implies the following truth table:
a b (a OR b)
0 0 0
0 1 1 (a OR b or Both, a and b, must be true to get a true result)
1 0 1
1 1 1

A logical AND implies the following truth table:
a b (a AND b)
0 0 0
0 1 0
1 0 0
1 1 1 (Both a AND b, must be true to get a true result)

So, here we have to make a logical OR with both 0xc3 and 0xb1 HIGH nibble,
a nibble is a half byte (4 bits), so we have to make a logical OR between
1100 (0xc) and 1011 (0xb), we going to get this: 1111 (0xf), then we have to make
a logical AND between both LOW nibble, 0011 (0x3) and 0001 (0x1), we going to get
this: 0001, so, if we want to see the final result, we have to put HIGH and LOW
nibble on his Byte position, like this: 1111 0001 (0xf1) and that is nothing
more and nothing less than "ñ" (to check this out, try the following: print(chr(0xf1));).

This "<<" is a logical shift left, if we have this binary number 0001 (1) and we make this:
0001 << 2 we'll get 0100 (4) right bits are filled with 0's.

PS: I'm so sorry about my english, I know, is horrible :P

jakub dot lopuszanski at nasza-klasa dot pl ¶

11 years ago

`Be aware that rawurldecode does not warn you in any way if the output is nonvalid UTF-8.
For example if the input passed to the function is just "%C5", then since C is 1100 in binary, and UTF-8 characters starting with 110 should be followed by another character, the result of rawurldecode will be just a single byte (with value \xC5) which is not a correct UTF-8.
Confront this with for example Javascript which will warn you about it:

JAVASCRIPT:

decodeURI("%C5")
URIError: URI malformed

decodeURIComponent("%C5")
URIError: URI malformed

unescape("%C5")
"Å"

PHP:
var_dump(rawurldecode("%C5"))
string(1) "▒"

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