php - 如何使用php从HTML表格中提取数据

Question

我一直在尝试不同的方法从 HTML 表中提取数据，例如使用 xpath。表不包含任何类，所以我不确定如何在没有类或 Id 的情况下使用 xpath。正在从 rss xml 文件中检索此数据。我目前正在使用 DOM。提取数据后，我将尝试按职位对表格进行排序

这是我的php代码

$html='';
$xml= simplexml_load_file($url) or die("ERROR: Cannot connect to url\n check if report still exist in the Gradleaders system");

/*What we do here in this loop is retrieve all content inside the encoded content, 
*which includes the CDATA information. This is where the HTML and styling is included.
*/

foreach($xml->channel->item as $cont){
    $html=''.$cont->children('content',true)->encoded.'<br>';   //actual tag name is encoded 
}

$htmlParser= new DOMDocument();     //to parse html using DOMDocument
libxml_use_internal_errors(true);   // your HTML gives parser warnings, keep them internal
$htmlParser->loadHTML($html);       //Loaded the html string we took from simple xml

$htmlParser->preserveWhiteSpace = false;
$tables= $htmlParser->getElementsByTagName('table');
$rows= $tables->item(0)->getElementsByTagName('tr');

foreach($rows as $row){
    $cols = $row->getElementsByTagName('td');
    echo $cols;
}

这是我从中提取信息的 HTML

<table cellpadding='1' cellspacing='2'>
  <tr>
    <td><b>Job Title:</b></td>
    <td>Job Example </td>
  </tr>
  <tr>
    <td><b>Job ID:</b></td>
    <td>23992</td>
  </tr>
  <tr>
    <td><b>Job Description:</b></td>
    <td>Just a job example </td>
  </tr>
  <tr>
    <td><b>Job Category:</b></td>
    <td>Work-study Position</td>
  </tr>
  <tr>
    <td><b>Position Type:</b></td>
    <td>Work-study</td>
  </tr>
  <tr>
    <td><b>Applicant Type:</b></td>
    <td>Work-study</td>
  </tr>
  <tr>
    <td><b>Status:</b></td>
    <td>Active</td>
  </tr>
  <tr>
    <td colspan='2'><b><a href='https://www.myjobs.com/tuemp/job_view.aspx?token=I1iBwstbTs2pau+SjrYfWA%3d%3d'>Click to View More</a></b></td>
  </tr>
</table>

Answer 1

您可以使用 xpath query('//td') 并使用 C14N()< 检索 td html/，类似于:

$dom = new DOMDocument();
$dom->loadHtml($html);
$x = new DOMXpath($dom);
foreach($x->query('//td') as $td){
    echo $td->C14N();
    //if just need the text use:
    //echo $td->textContent;
}

---

输出:

<td><b>Job Title:</b></td>
<td>Job Example </td>
<td><b>Job ID:</b></td>
...

---

C14N();

Returns canonicalized nodes as a string or FALSE on failure

---

更新:

Another question, how can I grab individual Table Data? For example, just grab, Job ID

使用XPath包含，即:

foreach($x->query('//td[contains(., "Job ID:")]') as $td){
    echo $td->textContent;
}

---

更新 V2:

How can I get the next Table Data after that (to actually get the Job Id) ?

使用following-sibling::*[1]，即:

echo $x->query('//td[contains(*, "Job ID:")]/following-sibling::*[1]')->item(0)->textContent;
//23992