通过DOM解析HTML表

Question

我相信页面的标记是我遇到的问题的一部分，所以我认为我需要发布源代码以及JSFiddle JSFiddle和原始GIS页面

我正在尝试从底部的表格中获取诸如名称：和地址：的信息。

尝试解决方案：

我编写了以下代码，希望能看到所有表数据，但是我要从中获取数据的表却什么也没有返回。

 <?php
 $k=0;
 $num=1000;
 var_dump(libxml_use_internal_errors(true));
 $domOb = new DOMDocument();
 $html = @$domOb->loadHTMLFile('http://www.gis.catawba.nc.us/website/Parcel/parcel_main.asp?Cmd=query&key=372215634301&type=P');
 $domOb->preserveWhiteSpace = false; 
 $items = $domOb->getElementsByTagName('td'); 
 while ($k<(int)$num){
 echo $items->item($k++)->nodeValue.'<br>'; 
 };
 ?>

返回的是：

bool（false）房地产搜索-旧地图图层可见常见问题解答帮助GIS主页

因此，我希望有人可以告诉我我做错了什么，从而错过了我正在寻找的所有数据？ 如何才能尽可能简单/简单地提取姓名和地址？

也尝试使用Xpath进行以下操作，但收到很多警告...

 $dom = new DOMDocument;
 $dom->load('http://www.gis.catawba.nc.us/website/Parcel/parcel_main.asp?Cmd=query&key=372215634301&type=P');
 $s = simplexml_import_dom($dom);

 echo $name = $s->xpath('//table[@class="words13]/td[contains(text(), "Name:")]');
 echo $add = $s->xpath('//table[@class="words13]/td[contains(text(), Address:)]');

使用user2518542的代码并结合hakre代码，我得到以下内容

 $ch = curl_init();  
 curl_setopt($ch, CURLOPT_URL,"http://www.gis.catawba.nc.us/website/Parcel/parcel_main.asp?Cmd=QUERY&key=372215634301&type=P&width=1280&height=923");
 curl_setopt($ch, CURLOPT_TIMEOUT, 30); //timeout after 30 seconds
 curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
 $result=curl_exec ($ch);
 curl_close ($ch);
 $doc->loadHTML($result);

 $tds = $doc->getElementsByTagname('td');
 foreach($tds as $td) {
 printf(" * %s\n", $td->textContent);
 echo '<br>';
 }

以下代码成功打印出所有标签。

Answer 1

您要查找的表单元格不属于该HTML文档。 首先，您需要了解网络爬虫的基础知识，建议您借用一些有关该主题的书籍并通读它们。

上图书馆的时间;）

---

如果表单元格在文档中（它似乎有所不同，有时是不同的，有时不是），原始示例将显示它，这也演示了如何在DOMNodeList上进行迭代：

$doc = new DOMDocument();

libxml_use_internal_errors(true);
$doc->loadHTMLFile('Catawba County Legacy Map Server.html');

$tds = $doc->getElementsByTagname('td');
foreach($tds as $td) {
    printf(" * %s\n", $td->textContent);
}

示例输出：

php "test.php" (in directory: /home/hakre/php/test)
 *
 * Real Estate Search - Legacy
 *
 *
 *
 *
 *
 *
 *
 *
 *
 * Map Layers
 * visible
 *
 *
 * Parcels
 *
 * Parcel Annotation
 *
 * Address Points
 *
 * Misc. Lines
 *
 * Structures
 *
 * Contour Lines
 *
 * Soils
 *
 * Townships
 *
 * Water Features
 *
 * Tiles
 *
 * Flood Zone
 *
 * Agricultural District
 *
 * Aerial 2009
 *
 * Aerial 2005
 *
 * Aerial 2002
 *
 * Cities
 *
 * Print the Map  
 * Print Map and Parcel Report  
 * Print the Parcel Report  
 * Assessment Report  
 * List all Owners  
 * Deed History Report
 * Parcel Information:
 * Owner Information:
 * Parcel ID: 372215634301
 * Name: PENLEY TREASURE B
 * Parcel Address: 3152 7TH AV SE 
 * Name2:  
 * City: CONOVER 28613
 * Address: 5508 SWINGING BRIDGE RD
 * LRK(REID): 57186
 * Address2:  
 * Deed Book/Page: 1906/0741 Deed Image
 * City: CONOVER
 * Subdivision: FOREST HGTS
 * State/Zip: NC 28613-7415
 * Lots: 1-4
 *
 * Block: C
 *
 * Last Sale:
 * School Information:
 * Plat Book/Page: 8/119 Plat Image
 * School District: COUNTY
 * Calculated Acreage: 0.31
 * Elementary School: WEBB A MURRAY
 * Tax Map: 167H  04006A
 * Middle School: ARNDT
 * State Road:  
 * High School: ST STEPHENS
 * Township: HICKORY
 * School Map
 *  
 *  
 * Tax/Value Information:  Tax Rates(pdf)
 * Zoning Information:
 * Municipal Tax District:  
 * Zoning District: HICKORY
 * Fire District: HICKORY RURAL
 * Zoning1: OI
 * Tax Account Number:  
 * Zoning2:  
 * Market Building(s) Value: $55,400
 * Zoning3:  
 * Market Land Value: $20,300
 * Zoning Overlay:  
 * Market Total Value: $75,700
 * Small Area:  
 * Year Built/Remodeled: 1959  
 * Split Zoning District 1/2: 0/0
 * Current Tax Bill
 * Zoning Agency Phone Numbers
 * Miscellaneous:
 *  
 * Voter Precinct:P35
 * Firm Panel Date: 9/5/2007
 * Building Permits for this parcel
 * Firm Panel #: 3710372200J
 * WaterShed:  
 * 2010 Census Tract: 011000
 * WaterShed Split:  
 * 2010 Census Block: 3035
 * Parcel Report Data Descriptions
 * Agricultural District:  
 * FAQ's
 * Help
 * GIS Home
Compilation finished successfully.

Answer 2

使用XPath查找//table[@class="words13]/td[contains(text(), 'Name:')]和//table[@class="words13]/td[contains(text(), 'Address:')]

Answer 3

尝试这个

$ch = curl_init();  
curl_setopt($ch, CURLOPT_URL,"http://www.gis.catawba.nc.us/website/Parcel/parcel_main.asp?    Cmd=QUERY&key=372215634301&type=P&width=1280&height=923");
curl_setopt($ch, CURLOPT_TIMEOUT, 30); //timeout after 30 seconds
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
$result=curl_exec ($ch);
curl_close ($ch);
echo $result;exit;

您将获得整页的源代码，然后可以通过pregreplace获得所需的信息。