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run code in 150+ php & hhvm versions
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<?php class MyDOMDocument extends DOMDocument { const HTML_EXPORT_CHILDREN = 1; public function saveHTML($node = null, $flags = 0) { $result = ''; if ($node === null) { $node = $this->documentElement; } if ($flags & self::HTML_EXPORT_CHILDREN) { foreach ($node->childNodes as $child) { $result .= parent::saveHTML($child); } } else { $result = parent::saveHTML($node); } return $result; } } $html = <<<HTML <div>hello</div> <div>world</div> HTML; $doc = new DOMDocument; $doc->loadHTML($html); $frag = $doc->createDocumentFragment(); $body = $doc->getElementsByTagName('body')->item(0); foreach ($body->childNodes as $child) { $frag->appendChild($child->clone(true)); } echo $doc->saveHTML($frag); echo PHP_EOL; echo PHP_EOL; echo $doc->saveHTML();
based on Ev5Wt
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined method DOMElement::clone() in /in/amM4T:39 Stack trace: #0 {main} thrown in /in/amM4T on line 39
Process exited with code 255.
Output for 5.0.0 - 5.1.1, 5.1.3 - 5.6.28, hhvm-3.12.0
Fatal error: Call to undefined method DOMElement::clone() in /in/amM4T on line 39
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.2
Fatal error: Call to undefined method DOMElement::clone() in /in/amM4T on line 40
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/amM4T on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/amM4T on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/amM4T on line 5
Process exited with code 255.