SimpleXMLElement::addChild erzeugt Warnung #11
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Wenn man das Docker Image verwendet, wird beim Aufruf der test.html nach dem Absenden unter Umständen Warnings in den Output generiert:
SimpleXMLElement::addChild(): unterminated entity reference
Anscheinend beschreibt die Warning, dass im Value Symbole genutzt werden, die im XML eine besondere Bedeutung haben. Also bspw
&
. Dies kann man bei Namen wie "Schmitt GmbH & Co KG" sehen.