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run code in 150+ php & hhvm versions
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<?php $xmlstr = <<<XML <?xml version='1.0' standalone='yes'?> <medium val="organic"> <source val=""> <campaign val=""> <lever3 val="seo" /> <lever2 val="seo" /> <lever1 val="trafic_gratuit" /> </campaign> </source> </medium> <medium val="cpc"> <source val=""> <campaign val="remarketing"> <lever3 val="sem-remarketing" /> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> </source> <source val="leguide"> <campaign val=""> <lever3 val="comparateur-leguide" /> <lever2 val="comparateur" /> <lever1 val="trafic_payant" /> </campaign> </source> <source val="google"> <campaign val="marque"> <lever3 val="sem-marque-google" /> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> <campaign val="auchan-fil_rouge"> <lever3 val="sem-marque-google" /> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> <campaign val="horsmarque"> <lever3 val="sem-hors-marque-google" /> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> </source> <source val="bing"> <campaign val="auchan-fil_rouge"> <lever3 val="sem-marque-yahoo_bing" /> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> <campaign val="marque"> <lever3 val="sem-marque-yahoo_bing"/> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> <campaign val="horsmarque"> <lever3 val="sem-horsmarque-yahoo_bing"/> <lever2 val="sem" /> <lever1 val="trafic_payant" /> </campaign> </source> </medium> <medium val="cpa"> <source val="affilinet"> <campaign val=""> <lever3 val="affiliation" /> <lever2 val="affiliation" /> <lever1 val="trafic_payant" /> </campaign> </source> </medium> <!-- ETC --> XML; $xml = new SimpleXMLElement($xmlstr); $res = $xml->xpath("/medium/atribute::cpa/campaign/attribute::"); while(list( , $node) = each($res)) { echo '/a/b/c: ',$node,"\n"; }
Output for 7.0.0 - 7.1.0
Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : XML declaration allowed only at the start of the document in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): <?xml version='1.0' standalone='yes'?> in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): ^ in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): Entity: line 13: parser error : Extra content at the end of the document in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): <medium val="cpc"> in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): ^ in /in/5YXqX on line 78 Fatal error: Uncaught Exception: String could not be parsed as XML in /in/5YXqX:78 Stack trace: #0 /in/5YXqX(78): SimpleXMLElement->__construct(' <?xml versi...') #1 {main} thrown in /in/5YXqX on line 78
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /in/5YXqX:78 Stack trace: #0 /in/5YXqX(78): SimpleXMLElement->__construct() #1 {main} Entity: line 1: parser error : XML declaration allowed only at the start of the document <?xml version='1.0' standalone='yes'?> ^ Entity: line 13: parser error : Extra content at the end of the document <medium val="cpc"> ^
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.1.1, 5.1.3 - 5.6.21
Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : XML declaration allowed only at the start of the document in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): <?xml version='1.0' standalone='yes'?> in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): ^ in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): Entity: line 13: parser error : Extra content at the end of the document in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): <medium val="cpc"> in /in/5YXqX on line 78 Warning: SimpleXMLElement::__construct(): ^ in /in/5YXqX on line 78 Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /in/5YXqX:78 Stack trace: #0 /in/5YXqX(78): SimpleXMLElement->__construct(' <?xml versi...') #1 {main} thrown in /in/5YXqX on line 78
Process exited with code 255.
Output for 5.1.2
Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : XML declaration allowed only at the start of the document in /in/5YXqX on line 79 Warning: SimpleXMLElement::__construct(): <?xml version='1.0' standalone='yes'?> in /in/5YXqX on line 79 Warning: SimpleXMLElement::__construct(): ^ in /in/5YXqX on line 79 Warning: SimpleXMLElement::__construct(): Entity: line 13: parser error : Extra content at the end of the document in /in/5YXqX on line 79 Warning: SimpleXMLElement::__construct(): <medium val="cpc"> in /in/5YXqX on line 79 Warning: SimpleXMLElement::__construct(): ^ in /in/5YXqX on line 79 Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /in/5YXqX:79 Stack trace: #0 /in/5YXqX(79): SimpleXMLElement->__construct(' <?xml versi...') #1 {main} thrown in /in/5YXqX on line 79
Process exited with code 255.
Output for 5.0.3 - 5.0.5
Warning: Entity: line 1: parser error : XML declaration allowed only at the start of the document in /in/5YXqX on line 78 Warning: <?xml version='1.0' standalone='yes'?> in /in/5YXqX on line 78 Warning: ^ in /in/5YXqX on line 78 Warning: Entity: line 13: parser error : Extra content at the end of the document in /in/5YXqX on line 78 Warning: <medium val="cpc"> in /in/5YXqX on line 78 Warning: ^ in /in/5YXqX on line 78 Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /in/5YXqX:78 Stack trace: #0 /in/5YXqX(78): SimpleXMLElement->__construct(' <?xml versi...') #1 {main} thrown in /in/5YXqX on line 78
Process exited with code 255.
Output for 5.0.0 - 5.0.2
Warning: Entity: line 1: parser error : XML declaration allowed only at the start of the document in /in/5YXqX on line 78 Warning: <?xml version='1.0' standalone='yes'?> in /in/5YXqX on line 78 Warning: ^ in /in/5YXqX on line 78 Warning: Entity: line 13: parser error : Extra content at the end of the document in /in/5YXqX on line 78 Warning: <medium val="cpc"> in /in/5YXqX on line 78 Warning: ^ in /in/5YXqX on line 78 Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /in/5YXqX:78 Stack trace: #0 {main} thrown in /in/5YXqX on line 78
Process exited with code 255.
Output for 4.3.2 - 4.4.1, 4.4.3 - 4.4.9
Fatal error: Cannot instantiate non-existent class: simplexmlelement in /in/5YXqX on line 78
Process exited with code 255.
Output for 4.4.2
Fatal error: Cannot instantiate non-existent class: simplexmlelement in /in/5YXqX on line 79
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: simplexmlelement in /in/5YXqX on line 78