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<?php $xml = new SimpleXMLElement('<root/>'); $xml->addChild('a', 1); $xml->addChild('a', 2); $xml->addChild('b', array('a','b')); print_r($xml);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
Fatal error: Uncaught TypeError: SimpleXMLElement::addChild(): Argument #2 ($value) must be of type ?string, array given in /in/u3fcu:6 Stack trace: #0 /in/u3fcu(6): SimpleXMLElement->addChild('b', Array) #1 {main} thrown in /in/u3fcu on line 6
Process exited with code 255.
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: SimpleXMLElement::addChild() expects parameter 2 to be string, array given in /in/u3fcu on line 6 SimpleXMLElement Object ( [a] => Array ( [0] => 1 [1] => 2 ) )

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