问题
Is there any way to tell DOMDocument to use single quotes instead of double quotes for attributes?
回答1:
No. DOMDocument is a data-oriented access API for XML. And it serializes the documents however it wants to.
There is no ->save() flag http://www.php.net/manual/en/libxml.constants.php in PHP to accomplish it. And other language bindings don't allow it either: Can nokogiri use single quotes for attributes on saving xml?
And this is because libxml itself does provide no means to override this. libxml2/xmlsave.h and others mention no quote-style flags. So, I'm afraid you're really out of luck.
来源：https://stackoverflow.com/questions/5473520/php-dom-and-single-quotes