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<?php $xml = new SimpleXMLElement('<xml></xml>', LIBXML_NOEMPTYTAG); $output = $xml->addChild('child1'); $output->addChild('child2', "value"); $output->addChild('noValue', ''); echo $xml->asXML();
Output for 5.1.3 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
<?xml version="1.0"?> <xml><child1><child2>value</child2><noValue/></child1></xml>
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.2
Fatal error: Call to undefined method SimpleXMLElement::addChild() in /in/4m76E on line 4
Process exited with code 255.
Output for 5.1.0 - 5.1.1
Fatal error: Uncaught exception 'Exception' with message 'SimpleXMLElement::__construct() expects exactly 1 parameter, 2 given' in /in/4m76E:2 Stack trace: #0 /in/4m76E(2): SimpleXMLElement->__construct('<xml></xml>', 4) #1 {main} thrown in /in/4m76E on line 2
Process exited with code 255.
Output for 5.0.3 - 5.0.5
Notice: Use of undefined constant LIBXML_NOEMPTYTAG - assumed 'LIBXML_NOEMPTYTAG' in /in/4m76E on line 2 Fatal error: Uncaught exception 'Exception' with message 'SimpleXMLElement::__construct() expects exactly 1 parameter, 2 given' in /in/4m76E:2 Stack trace: #0 /in/4m76E(2): SimpleXMLElement->__construct('<xml></xml>', 'LIBXML_NOEMPTYT...') #1 {main} thrown in /in/4m76E on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.2
Notice: Use of undefined constant LIBXML_NOEMPTYTAG - assumed 'LIBXML_NOEMPTYTAG' in /in/4m76E on line 2 Fatal error: Uncaught exception 'Exception' with message 'SimpleXMLElement::__construct() expects exactly 1 parameter, 2 given' in /in/4m76E:2 Stack trace: #0 {main} thrown in /in/4m76E on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: simplexmlelement in /in/4m76E on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: simplexmlelement in /in/4m76E on line 2