5.2 (5.2.17 on my web server and 5....">
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PHP XML output error: "XML declaration or text not at the beginning of the object"

I am using PHP version> 5.2 (5.2.17 on my web server and 5.3.6 on my local host) with the following settings:

output_buffering = On
output_handler = ob_gzhandler

In the following PHP script, I output an XML response for use with jQuery / AJAX

if (empty($_GET))
{
    $Response = new Response('getlanguage');
    $Response->DisplayLanguage(LanguagesManager::GetLanguage());
    die();
}

IOManager::InputSanitizeRequest($_GET);
$Language = isset($_GET['language']) ? $_GET['language'] : '';

$Response = new Response('setlanguage');

if (LanguagesManager::ValidateLanguage($Language))
{
    LanguagesManager::SetLanguage($Language);
    $Response->DisplayResult(true);
}
else
    $Response->DisplayResult(false);

But my jQuery / AJAX function does not work, and if I try to manually check the output of my PHP script, I get the following error in Mozilla Firefox:

XML Parsing Error: XML or text declaration not at the start of entity
Address: http://127.0.0.1/responses/requestlanguage.php?language=it
Line Number 1, Column 2: <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-^

And this is caused by a trailing space before the XML declaration:

" <?xml version="1.0" encoding="UTF-8" standalone="yes"?>"

I checked my PHP tags and everything is fine. Having finished my code a bit, I shared something incredible: a space is created by this function:

LanguagesManager::ValidateLanguage($Language)

public static function ValidateLanguage($Language)
{
    return in_array($Language, self::GetSupportedLanguages());
}

if, "", ... , . - , ? - ?

+3
1

, , :

ob_start();
// here the code part, which seems to print the whitespace (but nothing else)
$langValidated = LanguagesManager::ValidateLanguage($Language);
ob_end_clean();

if ($langValidated)
{
    LanguagesManager::SetLanguage($Language);
    $Response->DisplayResult(true);
}
else
    $Response->DisplayResult(false);
0

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