Mapguide utility function cause LoadMap to fail

[beginbenoit]

In fusion\layers\MapGuide\php\Utility.php, the function ByteReaderToString will cause LoadMap.php calls to unexpectedly terminate during the building of the JSON. The code in its current state likely uses the maximum amount of memory available for the process to run and PHP throws an exception that I was unfortunately unable to trap. The function should be changed to use the built-in ToString function of the MgByteReader.

function ByteReaderToString($byteReader)
{
    return $byteReader->ToString();
}

It would be possible to add some validation to prevent any issues, such as calling GetMimeType to validate that the ToString will return something that is the actual textual representation of the content held in it.

[madair]

(In [1823]) closes #234: use built-in methods where appropriate