代码如下：
1
636$html = <<
Test
abcdefghijklmn
opqrstuvwxyz
EOF;
// create document object model
$dom = new DOMDocument();
// load html into document object model
@$dom->loadHTML($html);
// create domxpath instance
$xPath = new DOMXPath($dom);
// get all elements with a particular id and then loop through and print the href attribute
$elements = $xPath->query('//*[@id="content"]/p/span');
$content = $elements->item(0)->nodeValue;
echo $content; 内容里的
8.18 更新：
$html = <<
Test
abcdefghijklmn
opqrstuvwxyz
EOF;
// create document object model
$dom = new DOMDocument();
// load html into document object model
@$dom->loadHTML($html);
// create domxpath instance
$xPath = new DOMXPath($dom);
// get all elements with a particular id and then loop through and print the href attribute
$elements = $xPath->query('//*[@id="content"]/p/span');
$nodeName = $elements->item(0)->nodeName;
// $content = $elements->item(0)->nodeValue;
$content = $dom->saveXml($elements->item(0));
$content = $dom->saveHtml($elements->item(0));
$content = preg_replace(array("#^<{$nodeName}.*>#isU", "#$#isU"), array('', ''), $content);
echo $content; 
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自己找到了办法。。。