Unable add namespace with PHPs SimpleXML -

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I am creating an Atom feed when I add xmlns: i as an attribute Tried below - 

  $ node-> Add Add ("xmlns: i", "http://www.w3.org/2001/XMLSchema-instance");

I found it as output - 

  i = "http://www.w3.org/2001/XMLSchema-instance"

"xmlns:" part was cut. I need to avoid : - character? Or is there any other way of adding this namespace?

If you want to add an attribute from the namespace / prefix i $ node Not already disturbed in declaring the namespace in the first parameter, use the third parameter of addAttribute () to provide the namespace Yuri for the prefix. 

  $ node = new SimpleXMLElement ('& lt; root & gt; & lt; / root & gt;'); $ Node- & gt; Add Junk ("i: somename", "somevalue", 'http://www.w3.org/2001/XMLSchema-instance'); Echo $ node-> AsXml ();

Print 

  & lt ;? Xml version = "1.0"? & Gt; & Lt; Root xmlns: i = "http://www.w3.org/2001/XMLSchema-instance" i: somename = "somevalue" />

If the attribute is not required, you can delete it from unset () , leaving the namespace declaration. 

  unset ($ node-> Attributes ('I', true) ['Somnam']);

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