__autoload() and class_exists()

Hi,

I just found this strange behaviour in PHP5:

When using class_exists() to test, whether a class exists, the magic
function __autoload() is called:

function __autoload($class)
{
echo "Trying to load $class\n";
}

if (!class_exists('DB')) {
echo "DB does not exist.\n";
}

You'll get:

Trying to load DB
DB does not exist.

Is this a bug or the desired behaviour? It's pretty annoying, when you
are trying to use __autoload() as a fallback if a class could not be
loaded from directories defined by the user...

Best regards,

Stephan

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