”;
The DOM extension in PHP comes with extensive functionality with which we can perform various operations on XML and HTML documents. We can dynamically construct a DOM object, load a DOM document from a HTML file or a string with HTML tag tree. We can also save the DOM document to a XML file, or extract the DOM tree from a XML document.
The DOMDocument class is one the most important classes defined in the DOM extension.
$obj = new DOMDocument($version = "1.0", $encoding = "")
It represents an entire HTML or XML document; serves as the root of the document tree. The DOMDocument class includes definitions of a number of static methods, some of which are introduced here −
| Sr.No | Methods & Description |
|---|---|
| 1 |
createElement
Create new element node |
| 2 |
createAttribute
Create new attribute |
| 3 |
createTextNode
Create new text node |
| 4 |
getElementById
Searches for an element with a certain id |
| 5 |
getElementsByTagName
Searches for all elements with given local tag name |
| 6 |
load
Load XML from a file |
| 7 |
loadHTML
Load HTML from a string |
| 8 |
loadHTMLFile
Load HTML from a file |
| 9 |
loadXML
Load XML from a string |
| 10 |
save
Dumps the internal XML tree back into a file |
| 11 |
saveHTML
Dumps the internal document into a string using HTML formatting |
| 12 |
saveHTMLFile
Dumps the internal document into a file using HTML formatting |
| 13 |
saveXML
Dumps the internal XML tree back into a string |
Example
Let us use the following HTML file for this example −
<html>
<head>
<title>Tutorialspoint</title>
</head>
<body>
<h2>Course details</h2>
<table border = "0">
<tbody>
<tr>
<td>Android</td>
<td>Gopal</td>
<td>Sairam</td>
</tr>
<tr>
<td>Hadoop</td>
<td>Gopal</td>
<td>Satish</td>
</tr>
<tr>
<td>HTML</td>
<td>Gopal</td>
<td>Raju</td>
</tr>
<tr>
<td>Web technologies</td>
<td>Gopal</td>
<td>Javed</td>
</tr>
<tr>
<td>Graphic</td>
<td>Gopal</td>
<td>Satish</td>
</tr>
<tr>
<td>Writer</td>
<td>Kiran</td>
<td>Amith</td>
</tr>
<tr>
<td>Writer</td>
<td>Kiran</td>
<td>Vineeth</td>
</tr>
</tbody>
</table>
</body>
</html>
We shall now extract the Document Object Model from the above HTML file by calling the loadHTMLFile() method in the following PHP code −
<?php
/*** a new dom object ***/
$dom = new domDocument;
/*** load the html into the object ***/
$dom->loadHTMLFile("hello.html");
/*** discard white space ***/
$dom->preserveWhiteSpace = false;
/*** the table by its tag name ***/
$tables = $dom->getElementsByTagName(''table'');
/*** get all rows from the table ***/
$rows = $tables[0]->getElementsByTagName(''tr'');
/*** loop over the table rows ***/
foreach ($rows as $row) {
/*** get each column by tag name ***/
$cols = $row->getElementsByTagName(''td'');
/*** echo the values ***/
echo ''Designation: ''.$cols->item(0)->nodeValue.''<br />'';
echo ''Manager: ''.$cols->item(1)->nodeValue.''<br />'';
echo ''Team: ''.$cols->item(2)->nodeValue;
echo ''<hr />'';
}
?>
It will produce the following output −
Designation: Android Manager: Gopal Team: Sairam ________________________________________ Designation: Hadoop Manager: Gopal Team: Satish ________________________________________ Designation: HTML Manager: Gopal Team: Raju ________________________________________ Designation: Web technologies Manager: Gopal Team: Javed ________________________________________ Designation: Graphic Manager: Gopal Team: Satish ________________________________________ Designation: Writer Manager: Kiran Team: Amith ________________________________________ Designation: Writer Manager: Kiran Team: Vineeth ________________________________________
”;