WSDL API does not work in PHP 8.0

[Caprico85]

Preconditions (*)

1. OpenMage 20.0.10
2. PHP 8.0

Steps to reproduce (*)

1. Open http://example.com/index.php/api/v2_soap/index/?wsdl in browser

Expected result (*)

1. URL can be opened

Actual result (*)

The URL can't be opened. The error

Fatal error: Declaration of Mage_Api_Model_Wsdl_Config_Element::getChildren($source) must be compatible with SimpleXMLElement::getChildren() in [...]/app/code/core/Mage/Api/Model/Wsdl/Config/Element.php on line 179

is shown.

This works in PHP 7.4. It only fails since PHP 8.0. I'm not sure if this is caused because PHP 8.0 is more strict towards incompatible method signatures. Or if SimpleXMLElement has got a new method getChildren() in PHP 8.0.

[Flyingmana]

Solved by #1613

Thank you a lot for finding this.