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 β ΠΠΎΠ»ΡΡΠ°Π΅Ρ XML ΠΈΠ· ΡΠ΅ΠΊΡΡΠ΅Π³ΠΎ ΡΠ·Π»Π°, Π²ΠΊΠ»ΡΡΠ°Ρ ΡΠ°ΠΌ ΡΠ·Π΅Π»
ΠΠ΅ΡΠΎΠ΄ ΡΠΈΡΠ°Π΅Ρ ΡΠΎΠ΄Π΅ΡΠΆΠΈΠΌΠΎΠ΅ ΡΠ΅ΠΊΡΡΠ΅Π³ΠΎ ΡΠ·Π»Π°, Π²ΠΊΠ»ΡΡΠ°Ρ ΡΠ°ΠΌ ΡΠ·Π΅Π».
Π‘ΠΈΠ³Π½Π°ΡΡΡΠ° ΡΡΠ½ΠΊΡΠΈΠΈ Π½Π΅ ΡΠΎΠ΄Π΅ΡΠΆΠΈΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ².
ΠΠ΅ΡΠΎΠ΄ Π²ΠΎΠ·Π²ΡΠ°ΡΠ°Π΅Ρ ΡΠΎΠ΄Π΅ΡΠΆΠΈΠΌΠΎΠ΅ ΡΠ΅ΠΊΡΡΠ΅Π³ΠΎ ΡΠ·Π»Π°, Π²ΠΊΠ»ΡΡΠ°Ρ ΡΠ°ΠΌ ΡΠ·Π΅Π» ΠΊΠ°ΠΊ ΡΡΡΠΎΠΊΡ. ΠΠ΅ΡΠΎΠ΄ Π²ΠΎΠ·Π²ΡΠ°ΡΠ°Π΅Ρ ΠΏΡΡΡΡΡ ΡΡΡΠΎΠΊΡ, Π΅ΡΠ»ΠΈ Π²ΠΎΠ·Π½ΠΈΠΊΠ»Π° ΠΎΡΠΈΠ±ΠΊΠ°.
ΠΡΠ° ΡΡΠ½ΠΊΡΠΈΡ Π΄ΠΎΡΡΡΠΏΠ½Π° ΡΠΎΠ»ΡΠΊΠΎ Π΅ΡΠ»ΠΈ PHP ΡΠΊΠΎΠΌΠΏΠΈΠ»ΠΈΡΠΎΠ²Π°Π½ Ρ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠΎΠΉ libxml 20620 ΠΈΠ»ΠΈ ΡΡΠ°ΡΡΠ΅.
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.