问题
I am creating XML files with PHP DOMDocument, and these XML files can not contain line breaks.
But when I use the method "saveXML()", the generated XML comes with a line break between the definition and the initial tag, like this:
<?xml version="1.0" encoding="UTF-8"?>
<NFe xmlns="http://www.portalfiscal.inf.br/nfe"><infNFe...
Can I correct this problem in DOMDocument? Or do I have to do it after I generate the XML?
I'd like to correct this problem to get a result like this:
<?xml version="1.0" encoding="UTF-8"?><NFe xmlns="...
回答1:
By default, DOMDocument::$preserveWhiteSpace is true. Try setting it to false on the document in question, then calling saveXML again. This may have side effects should any whitespace inside the document actually matter. You should also make sure that DOMDocument::$formatOutput is false.
As said by Gordon, though, there is no logical reason whatsoever for the whitespace restriction. Though seriously, if you don't want any whitespace in there whatsoever, just make sure any CR/LF characters that you want to keep are entity-encoded and then $nonewlines = preg_replace("/[\r\n]/", '', $xml) to yank out the newlines that might remain after turning off Preserve and Format. But again, that's silly.
来源：https://stackoverflow.com/questions/5277120/xml-generated-by-domdocument-with-line-break