Question

我得到了下面的HTML字符串，我需要在其中访问特定id的值。

字符串如下

<form name="aspnetForm" method="post" action="userview.aspx" id="aspnetForm">
	<div>
	<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
	<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
	<input type="hidden" name="__LASTFOCUS" id="__LASTFOCUS" value="" />
	<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="test_value" />
	</div>

现在为了访问它，我编写了以下代码

$doc = new DOMDocument();
	@$doc->loadHTML($str);
	$finder = new DomXPath($doc);
	$spanner = $finder->query("//*[contains(@id, '__VIEWSTATE')]");
	foreach ($spanner as $node) 
    	{
   			 echo $node->nodeValue;
    	}

其中str是我的字符串。现在，每次我运行它时，它都会返回一个空白值

Answer 1

请尝试在此query部分中对此进行修改

$html = '<form name="aspnetForm" method="post" action="userview.aspx" id="aspnetForm">
<div>
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__LASTFOCUS" id="__LASTFOCUS" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="adsadsadsdsadsd" />
</div>';
 $doc = new DOMDocument;
 $doc->loadHTML($html);
 $xpath = new DOMXpath($doc);
 $val= $xpath->query('//input[@type="hidden" and @id = "__VIEWSTATE"]/@value' 
 );
print_r($val[0]->nodeValue);

如何从PHP中的HTML字符串中提取数据

1 个答案: