POST String Decoding in PHP

Question

Is ther any built in function in PHP to decode

przysi%25C4%2599gam%2520s%25C5%2582u%25C5%25BCy%25C4%2587

into

przysięgam służyć

?

Are you sure, that the program generating these strings knows what it's doing? If it is an UTF-8 url encoded string, it should read przysi%25%C4%25%99gam..., that is, with both bytes url-encoded. — Boldewyn
– Boldewyn, Commented Apr 1, 2010 at 11:10

user187291 · Accepted Answer · 2010-04-01 11:33:34Z

2

Ok, Gordon and Manos, you're both right (and both wrong ;)

It's just normal 'urldecode', but applied twice

$a = "przysi%25C4%2599gam%2520s%25C5%2582u%25C5%25BCy%25C4%2587";
$b = urldecode(urldecode($a));
var_dump($b);

answered Apr 1, 2010 at 11:33

user187291

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1 Comment

clops Over a year ago

This is interesting, because the String is being posted a mortal JS script using encodeURLEntity() -- no idea why the stuff is encoded twice then

ChrisR · Accepted Answer · 2010-04-01 11:03:33Z

2

My guess is that you have issues with urldecode and multibyte characters. Urldecode can only decode 8 bit characters and your string contains multibyte characters.

Check the urldecode manual page comments for some solutions.

answered Apr 1, 2010 at 11:03

ChrisR

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Comments

Community · Accepted Answer · 2023-11-17 19:32:19Z

2

urldecode — Decodes URL-encoded string

But I think that won't work on multibyte strings. See the comments on the manual page for possible userland workarounds and also http://www.zend.com//code/codex.php?ozid=839&single=1

edited Nov 17, 2023 at 19:32

CommunityBot

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answered Apr 1, 2010 at 10:57

Gordon

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1 Comment

clops Over a year ago

Negative. Urldecode fails on that one badly, as it decodes only %## characters.

Manos Dilaverakis · Accepted Answer · 2010-04-01 11:15:10Z

0

Have you tried this:

    function utf8_urldecode($str) {
      $str = preg_replace("/%u([0-9a-f]{3,4})/i","&#x\\1;",urldecode($str));
      return html_entity_decode($str,null,'UTF-8');;
  }

Taken from http://php.net/manual/en/function.urldecode.php

Edit: Your initial string is messed up. Did you urlencode it twice? Cause utf8_urldecode(utf8_urldecode($encoded string)) gives the correct result.

edited Apr 1, 2010 at 11:15

answered Apr 1, 2010 at 11:03

Manos Dilaverakis

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1 Comment

Gordon Over a year ago

gave przysi%C4%99gam%20s%C5%82u%C5%BCy%C4%87 on my machine.

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