从DOM中获取从特定id名称开始的div数据

问题描述：

我想要获取html div数据，其中id从特定名称或字符串开始。从DOM中获取从特定id名称开始的div数据

例如，假设我有这个网站的数据： -

<html> 
    <div id="post_message_1"> 
     somecontent1 
    </div> 
<div id="post_message_2"> 
     somecontent2 
    </div> 
    <div id="post_message_3"> 
     somecontent3 
    </div> 
</html>

为此，我试过卷曲。

 <?php 
     function file_get_contents_curl($url) 
     { 
     $ch = curl_init(); 
     curl_setopt($ch, CURLOPT_HEADER, 0); 
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
     curl_setopt($ch, CURLOPT_URL, $url); 
     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 
     $data = curl_exec($ch); 
     curl_close($ch); 
     return $data; 
     } 


     $html = file_get_contents_curl("myUrl"); 
     $fh = fopen("test.html", 'w'); // we create the file, notice the 'w'. This is to be able to write to the file once. 
     //writing response in newly created file 
     fwrite($fh, $html); // here we write the data to the file. 
     fclose($fh);      
     ?>

如果我使用

$select= $doc->getElementById("post_message_");

，则它不会返回数据，因为其搜索这个ID在DOM，但在HTML DIV ID只能从该字符串开始。它可能是post_message_1或post_message_2。

答

我会转的file_get_contents_curl输出到 SimpleXmlElement对象，我会使用的xpath

的功能之一例如，你可以这样做：

$html = <<<HTML 
<html> 
    <div id="post_message_1"> 
     somecontent1 
    </div> 
<div id="post_message_2"> 
     somecontent2 
    </div> 
    <div id="post_message_3"> 
     somecontent3 
    </div> 
</html> 
HTML; 

$dom = new SimpleXMLElement($html); 

var_dump($dom->xpath('//div[starts-with(@id, "post_message_")]'));

UPDATE

在你的情况下，你应该这样做：

$doc = new DOMDocument(); 
$doc->loadHTML(file_get_contents_curl($url)); 

$sxml = simplexml_import_dom($doc); 

var_dump($sxml->xpath('//div[starts-with(@id, "post_message_")]'));

嗨，感谢您的建议，但是当我使用xpath，然后我得到这个错误“PHP致命错误：未捕获异常'异常'消息'字符串不能被解析为XML'”，您可以了解HTML给，只是为了演示的目的。 – neo

您的意思是说您无法将'file_get_contents_curl'的html输出转换为php对象simplexmlElement？我的意思是，如果你可以利用'SimpleXMLElement'，你可以非常容易地做任何你需要的工作 – smarber

是的，很多警告也显示像“PHP Warning：SimpleXMLElement :: __ construct（）： English in /var/www/index.php on line 1“ – neo

答

我可能会迭代所有div，并使用他们的id的正则表达式来获得我需要的。

我不认为有一个更干净的方式来做到这一点，除非你可以编辑html页面代码并向包含消息的div添加类。

我正在提取另一个网站数据，所以我不能在HTML中添加一个类。 – neo

答

这里盐渍大锤，但我从来没有能够得到这样的模式在PHP中的工作 - 但正则表达式将工作 - >

$subject = $html; 
$pattern = '/id\=\"post_message_\d+\"\>(?<match>.*)<\/div\>/isUg'; 
preg_match($pattern, $subject, $matches); 

var_dump(trim($matches['match']));

正则表达式的解释：

id\=\"post_message_\d+\"\>(?<matches>.*)<\/div\>/isU 
id matches the characters id literally (case insensitive) 
\= matches the character = literally 
\" matches the character " literally 
post_message_ matches the characters post_message_ literally (case insensitive) 
\d+ match a digit [0-9] 
Quantifier: + Between one and unlimited times, as few times as possible, expanding as needed [lazy] 
\" matches the character " literally 
\> matches the character > literally 
(?<matches>.*) Named capturing group matches 
.* matches any character 
Quantifier: * Between zero and unlimited times, as few times as possible, expanding as needed [lazy] 
< matches the characters < literally 
\/ matches the character/literally 
div matches the characters div literally (case insensitive) 
\> matches the character > literally 
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z]) 
s modifier: single line. Dot matches newline characters 
U modifier: Ungreedy. The match becomes lazy by default. Now a ? following a quantifier makes it greedy

它只给我第一个div数据。可能需要一些修改。 – neo

答

我找到解决方案，它的工作正常。可能是这个代码会帮助别人。感谢@smarber，他的模式帮助我解决了这个问题。

<?php 
     function file_get_contents_curl($url) 
     { 
     $ch = curl_init(); 
     curl_setopt($ch, CURLOPT_HEADER, 0); 
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
     curl_setopt($ch, CURLOPT_URL, $url); 
     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 
     $data = curl_exec($ch); 
     curl_close($ch); 
     return $data; 
     } 


     $html = file_get_contents_curl("myUrl"); 
     $dom = new DOMDocument(); 
    $result = $dom->loadHTML($html); 
    $finder = new DomXPath($dom); 
     $nodes = $finder->query('//div[starts-with(@id, "post_message_")]'); 

     $tmp_dom = new DOMDocument(); 
    foreach ($nodes as $node) 
    { 
$tmp_dom->appendChild($tmp_dom->importNode($node,true)); 
    } 

     $innerHTML = trim($tmp_dom->saveHTML()); 
     $fh = fopen("test.html", 'w'); // we create the file, notice the 'w'. This is to be able to write to the file once. 
     //writing response in newly created file 
     fwrite($fh, $innerHTML); // here we write the data to the file. 
     fclose($fh);      
     ?>

从DOM中获取从特定id名称开始的div数据

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