想要使用xpath来解析html内容, PHP自带两个对象
DOMDocument，DOMXpath，其中初始化 loadHtml一般都会报很多警告，但是并不影响使用，用@屏蔽错误。
/**
* 初始化DOMXpath对象
*
* @param [type] $content 网页内容
* @param [array] $pathinfo 匹配信息
*
* @return void
*/
private function _createXpathObj($content, $patinfo)
{
// 如果没有xpath配置项，不初始化xpath
if (!$this->_existsXpathParse($patinfo)) {
return;
}
try {
$dom = new \DOMDocument();
@$dom->loadHtml($content);
$dom->normalize();
$xpath = new \DOMXpath($dom);
$this->xpathObj = $xpath;
} catch (\Exception $e) {
getService(‘logger‘)->warning(‘Parse html fail‘, [‘content‘ => $content]);
}
}
其中 $node 为 DOMElement 对象。
/**
* 获取Xpath解析值
*
* @param [type] $pat 匹配模式
*
* @return string
*/
private function _getXpathField($pat)
{
$objs = $this->xpathObj->query($pat);
if ($objs->length > 0) {
$node = $objs->item(0);
$outerHTML = $node->ownerDocument->saveHTML($node);
return trim($outerHTML);
# 作为示例 输出innerhtml
//$innerHTML = ‘‘;
//foreach ($node->childNodes as $childNode){
// $innerHTML .= $childNode->ownerDocument->saveHTML($childNode);
//}
//return $innerHTML;
# 作为示例 输出文本不含标签
//return $node->textContent; //$node->nodeValue;
}
return ‘‘;
}
示例
<?php
$dom = new DOMDocument(‘1.0‘,‘UTF-8‘);
$dom->loadHTML(‘<html><body><div><p>p1</p><p>p2</p></div></body></html>‘);
$node = $dom->getElementsByTagName(‘div‘)->item(0);
$outerHTML = $node->ownerDocument->saveHTML($node);
$innerHTML = ‘‘;
foreach ($node->childNodes as $childNode){
$innerHTML .= $childNode->ownerDocument->saveHTML($childNode);
}
echo ‘<h2>outerHTML: </h2>‘;
echo htmlspecialchars($outerHTML);
echo ‘<h2>innerHTML: </h2>‘;
echo htmlspecialchars($innerHTML);
?>