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<?php $xml=new SimpleXMLElement(''); var_dump($xml); echo $xml ? "true": "false"; ?>
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Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /t.php:2 Stack trace: #0 /t.php(2): SimpleXMLElement->__construct('') #1 {main} thrown in /t.php on line 2