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<?php $x = new SimpleXMLElement('<root><foo>x</foo></root>'); echo $x->jsonSerialize();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Call to undefined method SimpleXMLElement::jsonSerialize() in /in/W8j6F:5 Stack trace: #0 {main} thrown in /in/W8j6F on line 5
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Fatal error: Call to undefined method SimpleXMLElement::jsonSerialize() in /in/W8j6F on line 5
Process exited with code 255.

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