Please note that empty tags like <span></span> will be automatically converted to the short notation <span />. This could cause trouble in some cases.
(PHP 5 >= 5.2.0, PHP 7, PHP 8)
XMLReader::readOuterXml — Obtém XML do nó atual, incluindo ele mesmo
Lê o conteúdo do nó atual, incluindo o próprio nó.
Esta função não possui parâmetros.
Retorna o conteúdo do nó atual, incluindo ele mesmo, como uma string. Retorna string vazia em caso de falha.
Esta função só estará disponível quando o PHP for compilado com a libxml 20620 ou superior.
Please note that empty tags like <span></span> will be automatically converted to the short notation <span />. This could cause trouble in some cases.
Be aware that when you extract a piece of XML from a larger XML document using the readOuterXML() function, it tries to determine the namespaces (as defined in the original XML document) that apply to the new piece, and inserts them into the appropriate tags as xmlns attributes. This can be disconcerting, but it should be a benign alteration in most cases, and I understand that it causes the new chunk of XML to be correctly formatted so it is valid in it's own right.
As far as I'm aware it's not possible to change this behaviour.