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<?php class MyComment extends \DOMComment { } $dom = new DOMDocument(); $dom->registerNodeClass('DOMComment', 'MyComment'); var_dump($dom->createComment('Foo'));
based on NTmpk
Output for 5.3.11 - 5.3.29, 5.4.1 - 5.6.28, 7.0.0 - 7.1.0
object(MyComment)#2 (17) { ["data"]=> string(3) "Foo" ["length"]=> int(3) ["nodeName"]=> string(8) "#comment" ["nodeValue"]=> string(3) "Foo" ["nodeType"]=> int(8) ["parentNode"]=> NULL ["childNodes"]=> NULL ["firstChild"]=> NULL ["lastChild"]=> NULL ["previousSibling"]=> NULL ["attributes"]=> NULL ["ownerDocument"]=> string(22) "(object value omitted)" ["namespaceURI"]=> NULL ["prefix"]=> string(0) "" ["localName"]=> NULL ["baseURI"]=> NULL ["textContent"]=> string(3) "Foo" }
Output for hhvm-3.12.0
object(MyComment)#2 (18) { ["nodeName"]=> string(8) "#comment" ["nodeValue"]=> string(3) "Foo" ["nodeType"]=> int(8) ["parentNode"]=> NULL ["childNodes"]=> NULL ["firstChild"]=> NULL ["lastChild"]=> NULL ["previousSibling"]=> NULL ["nextSibling"]=> NULL ["attributes"]=> NULL ["ownerDocument"]=> string(22) "(object value omitted)" ["namespaceURI"]=> NULL ["prefix"]=> string(0) "" ["localName"]=> NULL ["baseURI"]=> NULL ["textContent"]=> string(3) "Foo" ["data"]=> string(3) "Foo" ["length"]=> int(3) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.10, 5.4.0
object(MyComment)#2 (0) { }
Output for 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/groWF on line 3 object(MyComment)#2 (0) { }
Output for 5.0.0 - 5.1.6
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/groWF on line 3 Fatal error: Call to undefined method DOMDocument::registerNodeClass() in /in/groWF on line 6
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/groWF on line 3 Fatal error: Class mycomment: Cannot inherit from undefined class domcomment in /in/groWF on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/groWF on line 3 Fatal error: Class mycomment: Cannot inherit from undefined class domcomment in /in/groWF on line 3