php读取xml文档遇到实体符号时出错,该如何解决
日期：2014-05-17 浏览次数：20532 次
php读取xml文档遇到实体符号时出错
如<name>aa bb</name>
中间有这这格的实体符号时
会报出这种警告
( ! ) Warning: DOMDocument::load() [domdocument.load]: Entity 'nbsp' not defined in file:
读取xml文档是这样子
$xml = new DOMDocument("1.0","UTF-8");
$xml->load('myxml.xml');
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能自己发现问题就好，既然不允许出现，你准备怎么解决呢？
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FROM PHP Manual
如<name>aa bb</name>
中间有这这格的实体符号时
会报出这种警告
( ! ) Warning: DOMDocument::load() [domdocument.load]: Entity 'nbsp' not defined in file:
读取xml文档是这样子
$xml = new DOMDocument("1.0","UTF-8");
$xml->load('myxml.xml');
------解决方案--------------------
能自己发现问题就好，既然不允许出现，你准备怎么解决呢？
------解决方案--------------------
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: <?php $str = <<<XML <?xml version="1.0" encoding="iso-8859-1"?> <div>This is a non-breaking space.</div> 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: <?php $str = <<<XML <?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE root [ <!ENTITY nbsp " "> ]> <div>This is a non-breaking space.</div> 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., <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">), 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 & 这三个不能出现
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