segfaults on throwing Exception

[razorness]

There is a Bug in PHP 5.6 which produces segfaults when you throw an exception encoded in ISO-8859-1 on a system with default charset UTF-8.

Throwing a KlarnaException caused by response faultCode !== 0 and faultString (ISO-8859-1) results in segfaults in apache child process.

Example:
https://github.com/klarna/php-xmlrpc/blob/v4.1/src/Klarna.php#L3661

To prevent this, you could use something like this:

throw new KlarnaException(
    iconv('ISO-8859-1//TRANSLIT', ini_get('default_charset'), $xmlrpcresp->faultString()), 
    $status
);

Tested on:

• Linux 3.16.0-4-amd64 Bug report and bugfix for problem with invalid characters in thrown exception #1 SMP Debian 3.16.7-ckt20-1+deb8u4 (2016-02-29) x86_64
• Apache/2.4.10 (Debian)
• PHP Version 5.6.17-0+deb8u1
• Default Charset: UTF-8

Test:

throw new Exception(iconv(ini_get('default_charset'), 'ISO-8859-1', 'ß'));

[slavo2]

Related issue: #2
Related pull requests: #3 , #4