PHP's base64_decode returns wrong result working in IIS

Question

I'm trying to show a jpg that was previously encoded in a WCF web service using:

<?php
require_once '../inc/config.php';
[...]
header("Content-type: image/jpg");
echo base64_decode($doc['BDATA']);

But I'm getting a

Can't display the image because it contains errors.

I've decoded the base64 string in this web app www.opinionatedgeek.com/dotnet/tools/base64decode/ and the result is right, but different that the one I'm getting with base64_decode, which is wrong.

Edit: I have two enviroments using the same code: Test and Production. It works fine in Test, but not in Production, so I'm thinking in some configuration problem.

I'm working with PHP 5.5.9 in Microsoft IIS.

An example of a string that base64_decode isn't decoding well: 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

Any ideas?

Edit 2: If I comment this line require_once '../inc/config.php'; and copy the code from config.php to my actual file, it works fine. What could be happening?

Answer 1

From base_64_decode manual comments

php <= 5.0.5's base64_decode( $string ) will assume that a space is meant to be a + sign where php >= 5.1.0's base64_decode( $string ) will no longer make that assumption

To fix this behavior try this code

$encodedData = str_replace(' ','+',$encodedData);
$decocedData = base64_decode($encodedData);

As this is no't your case then you have to check this answer
Because every thing work fine for me here on (WAMP)

EDIT: As in our below conversation

There are a lot of things that may corrupt header for example , if your file encoding is UTF-8 then you should save it as UTF-8 Without bom you can do this using notepad ++ , also make sure if you use FTP that your client didn't any chars to your file , rather than that every thing should work fine

Answer 2

base64 encoding is not completely standardised.

Some implementations use different characters, so you'll have to replace those characters before you run your decode.

further details