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<?php $foo = simplexml_load_string('<bar><baz>0</baz></bar>'); var_dump((bool) $foo->baz); var_dump($foo->baz); var_dump($foo->blah);
Output for 5.1.2 - 5.6.21, 7.0.0 - 7.1.0
bool(true) object(SimpleXMLElement)#2 (1) { [0]=> string(1) "0" } object(SimpleXMLElement)#2 (0) { }
Output for hhvm-3.12.0
bool(true) object(SimpleXMLElement)#3 (1) { [0]=> string(1) "0" } object(SimpleXMLElement)#4 (0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.1
bool(false) object(SimpleXMLElement)#2 (1) { [0]=> string(1) "0" } object(SimpleXMLElement)#2 (0) { }
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: simplexml_load_string() in /in/e5VDA on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: simplexml_load_string() in /in/e5VDA on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: simplexml_load_string() in /in/e5VDA on line 3