php讀取xml文檔遇到實體符號時出錯,該如何解決

php讀取xml文檔遇到實體符號時出錯
如aa bb
中間有這這格的實體符號時
會報出這種警告
( ! ) Warning: DOMDocument::load() [domdocument.load]: Entity 'nbsp' not defined in file:

讀取xml文檔是這樣子
$xml = new DOMDocument("1.0","UTF-8");
$xml->load('myxml.xml');

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能自己發現問題就好，既然不允許出現，你準備怎麼解決呢？
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FROM PHP Manual

PHP code

When using loadXML() to parse a string that contains entity references (e.g.,  ), be sure that those entity references are properly declared through the use of a DOCTYPE declaration; otherwise, loadXML() will not be able to interpret the string.Example:This is a non-breaking space.XML;$dd1 = new DOMDocument();$dd1->loadXML($str);echo $dd1->saveXML();?>Given the above code, PHP will issue a Warning about the entity 'nbsp' not being properly declared.  Also, the call to saveXML() will return nothing but a trimmed-down version of the original processing instruction...everything else is gone, and all because of the undeclared entity.Instead, explicitly declare the entity first:]>This is a non-breaking space.XML;$dd2 = new DOMDocument();$dd2->loadXML($str);echo $dd2->saveXML();?>Since the 'nbsp' entity is defined in the DOCTYPE, PHP no longer issues that Warning; the string is now well-formed, and loadXML() understands it perfectly.You can also use references to external DTDs in the same way (e.g., ), which is particularly important if you need to do this for many different documents with many different possible entities.Also, as a sidenote...entity references created by createEntityReference() do not need this kind of explicit declaration.
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恭喜lz。~~
thanks  ZT_king
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< > 和 &  這三個不能出現 
