PHP bug in if-else-if condition?

For debugging I've entered two echos to an if-else-if section in a method:

if ( $options instanceof Zend_Config ) {
    $options = $options->toArray();

    echo "1st condition true<br>";

} else if ( ! is_array($options) ) {


    echo "2nd condition true<br>";
    exit();

    throw n开发者_开发百科ew Bvb_Grid_Exception('options must be an instance from Zend_Config or an array');
}

The crazy thing is the output I'm getting is:

1st condition true
2nd condition true

Can you explain this?!?!

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The only explanation is that you are calling that routine twice.

The problem doesn't come from that piece of code you posted. It's something else.