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run code in 150+ php & hhvm versions
Bugs & Features
<?php $d = new DOMDocument('1.0'); $d->loadHTML('<head><title>untitled</title></head>'); var_dump( $d->saveHTML() );
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(157) "<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><head><title>untitled</title></head></html> "
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: domdocument in /in/noYZg on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: domdocument in /in/noYZg on line 3