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That is not how you build XML document in PHP. One of the reasons people hate PHP because it gets abused like this.

True, PHP has its own classes for building XML/HTML[0], although using it to build or parse HTML (say, from a cURL request) is a bit hairy. Proper headers should be sent as well.

[0]http://php.net/manual/en/class.domdocument.php

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