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解决php的loadXML()不能识别  的问题  

2008-04-09 16:51:14|  分类: php->xml |  标签: |举报 |字号 订阅

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来源:http://www.xuchao.cn/docs/php/function.dom-domdocument-loadxml.html

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&nbsp;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 "&#160;">
]>
<div>This&nbsp;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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